Chamberlain garage door opener troubleshooting

The Chamberlain company has more than 40 years of experience in manufacturing of home control products. The garage door openers and smartphone-enabled products by this brand are created for do-it-yourself installation.
Provided you use reliable information, Chamberlain garage door troubleshooting won’t take much effort, even if you are far from being an engineer.

If you have a Chamberlain garage door opener manual at hand, it can give you some insight into what’s going on. However, it is also convenient to use the charts below for quick tips on Chamberlain garage door repair.

Chamberlain GH garage door opener troubleshooting

The Chamberlain GH line-up includes industrial duty and heavy duty door operators. For instance, the GH model is a commercial door opener equipped with a maintenance alert system, which signals when the operator needs immediate service. Another model from the range, GH 5HP, is a heavy duty door operator with a 5 HP AC synchronous continuous duty brake motor.

Fault	Possible cause	Fix
The operator will not respond to any commands	a) No power supply	― Verify primary line voltage from pov/er source. Green POWER LED must be on.
	b) Operator control station is wired wrong	― Use the OPEN. CLOSE and STOP LEDs to help check correct wiring. Verify that the board is accepting commands by using the onboard station. Green LED next to stop button must be on.
	c) Interlock switch is activated	― Check Interlock(s). If more than one external interlock is present they must be v/ired in series. Green LED next to stop button must be on.
	d) Dial still in programming, option, or diagnostic mode	― Set dial to desired wiring type.
	e) Motor is malfunctioning	― Verify proper voltage getting to the motor (Check motor name plate).
	f) Motor thermal overload tripped	― Check to see if motor is hot. Allow motor to cool before attempting to move door. Cycle operator in constant pressure one full cycle open and close to reset fault.
	g) Possible accessory malfunction	― Disconnect all devices, reattach them one at a time testing for a failure after each one is replaced.
	h) Off Board relay may need to be replaced see wiring diagram	― When the OPEN or CLOSE button is pressed. Relay A or B LED should turn on and the door should move in the corresponding direction. If Relay A or B lights and the door does not move, off board relay may need to be replaced.
	i) Possible logic board failure	― Replace logic board.
Power led is not on	a) Loose secondary wiring connections or a faulty control transformer	― Repair or replace connections or control transformer.
	b) Hoist interlock switch	― Check interlock. Verify the manual release chain is not engaged.
Stop button led is noton	a) Control station not connected or v/ired correctly	― Check wiring to control station.
	b) Interlock switch	― Check interlock switch(es) for continuity.
The door will move about a foot then stop. After stopping, only constant pressure commands will move the door	a) RPM sensor is not connected properly or may need to be replaced	― Check the RPM assembly for loose connections. Check that RPM wheel is turning when operator is running. Check for foreign matter blocking optical lens.
	b) Clutch slipping	― Replace RPM sensor. ― Adjust clutch and verify that door is not binding.
The door will move most of the way towards a limit then stop. An extra open or close command is able to get door to complete cycle	The Maximum Run Timer is not set correctly	― Manually reprogram the Maximum Run Timer. OR reset the factory defaults.
The door will open some but not completely. An extra open is able to get the door to open completely	There may be a Mid Stop set	― Check to see if the Mid Stop LED is on. Clear the Mid Stop by turning the selector dial to program. Press and hold the MID STOP button for 5 seconds. Return dial to desired wiring type. To reset Open Mid Stop refer.
The door will open but will only close after a five second delay with constant pressure on the close button	a) The photoelectric sensors, edge or other sensing device is obstructed or activated	― If the on board LMEP LED is flashing, the photoelectric sensor are misaligned or not connected. Remove any obstructions, check the safety device wires for continuity and shorts.
	b) The logic board thinks that the direct connect photoelectric sensors are attached and blocked	― Unlearn the photoelectric sensors from the memory by resetting factory defaults.

Chamberlain HD920EV garage door opener troubleshooting

The HD920EV garage door opener created by the US-based company Chamberlain Group is a belt drive model with a battery backup feature. This option allows you to use the door opener even when electrical power is off.

Diagnostic code		Symptom	Solution
Up Arrow Rash(es)	Down Arrow Flash(es)
1	1	The garage door opener will not dose and the light bulbs flash.	Safety sensors are not installed, conneded, or wires may be cut Insped sensor wires for a disconneded or cut wire.
1	2	The garage door opener will not dose and the light bulbs flash.	There is a short or reversed wire for the safety sensors. Insped safety sensor wire at all staple and connection points, replace wire or corredas needed
1	3	The door control will not function.	The wires for the door control are shorted or the door control is faulty. Insped safety sensor wire at all staple points and connection points and replace wire or corred as needed.
1	4	The garage door opener will not dose and the light bulbs flash.	Safety sensors are misaligned or were momentarily obstruded. Realign both sensors to ensure both LEDs are steady and notflickering. Make sure nothing is hanging or mounted on the door that would interrupt the sensor's path while dosing.
1	5	Door moves 6-8' stops or reverses.	Manually open and dose the door. Check for binding or obstructions, such as a broken spring or door lock, corredas needed. Check wiring connections attravel module and atthe logicboard. Replace travel module if necessary.
		No movement, only a single dick.	Manually open and dose the door. Check for binding or obstructions, such as a broken spring or door lock, corred as needed. Replace logic board if necessary.
		Opener hums for 1 -2 seconds no movement	Manually open and dose the door. Check for binding or obstructions, such as a broken spring or door lock, corredas needed. Replace motor if necessary.
1	6	Door coasts after it has come to a complete stop.	Program travel to coasting position or have door balanced by a trained door systems techniaan.
2	1-5	No movement or sound.	Replaoe logicboard.
3	2	Unable to setthe travel or retain position.	Check travel module for proper assembly, replace if necessary.
3	3	The battery status LED is constantly flashing green.	Battery backup charging circuit error, replace the logic board.
4	1-4	Door is moving stops or reverses.	Manually open and dose the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. If the door is binding or sticking contact a trained door systems technidan. If door is not binding or sticking attempt to reprogram travel.
4	5	Opener runs approximately 6-8’, stops and reverses.	Communication error to travel module. Check travel module connections, replace travel module if necessary.
4	6	The garage door opener will not dose and the light bulbs flash.	Safety sensors are misaligned or were momentarily obstructed. Realign both sensors to ensure both LEDs are steady and not flickering. Make sure nothing is hanging or mounted on the door that would interrupt the sensor’s path while dosing.

Chamberlain LA400 garage door opener troubleshooting

Chamberlain LA400 and LA400-S are medium duty swing gate operators created for vehicular swing gates. These door openers can be used in Class I-III applications. One of the distinctive features of this series is a special type of assemble bracket providing greater mounting flexibility.

Fault	Possible cause	Fix
Operator is dead No led lights are on.	1) No voltage to board.	― Battery must be >23V, AC or Solar needs to be connected.
	2) Bad control board.	― Replace control board.
Operator does not run Unit does not respond to any commands.	1) Low/disconnected battery.	― Voltage must be >23V at battery connection.
	2) Remote not programmed.
	3) STOP connection loose/disconnected.	― Check STOP connections.
	4) Constant Open Command (Check LED’s).	― Clear all Open/Safety devices from obstruction.
	5) Limits not programmed correctly.	― Set the limit
	6) Bad control board.	― Replace control board.
Motor does not run Relays “click” when radio or SBC signal is given, but the operator does not move.	1) Low Battery.	― Voltage must be >23V at battery connection.
	2) Cable wiring between control box and operator arm disconnected or loose.	― Check wiring on control board to arm. replace wire if needed.
	3) Batteries not connected.	― Connect batteries.
	4) Bad motor.	― Replace motor.
	5) Bad control board.	― Replace control board.
Gate stops and reverses (Force Reversal)	1) Gate met an obstruction.	― Clear gate from obstruction.
	2) Force set too low.
	3) Bad gate hardware.	― Service/replace gate hardv/are.
	4) Incorrect Arm installation.
Rpm reversal	1) Obstructed Arm (bottoms out).	― Check for obstruction on arm, verify arm is not bottomed out.
	2) Bad RPM Sensor.	― Replace arm.
	3) Too much mA pulled off board.	― Move accessories to separate power source.
GATE STOPS Gate starts to run, then stops and does not reverse.	1) Low battery.	― Voltage must be >23V at battery connection.
	2) Gate met an obstruction.	― Clear gate from obstruction.
Gate opens but does not close	1) Constant Open Command (Check LED’s).	― Clear all Open/Safety devices from obstruction.
	2) Timer to Close not set.	― Set Timer to Close.
	3) Accessory device wired to Open Only command.	― Rewire desired accessory device to Single Button Input.
Audible beeps (3 times) when command is given.	1) Battery Low >23.5V	― Operator will resume normal operation once battery voltage reaches 24V.
Gate’s do not open/close in sync	1) Bi-Part Delay not set.	― Seе Bi-Part Delay
	2) Limits not programmed correctly.	― Set the limit
	3) Incorrect Arm Installation
Gate does not automatically close Auto Close Timer not closing gate.	1) Timer to Close not turned on.	Set Timer to Close.
	2) Gate has opened on Obstruction Reversal.	― Check DIAG code, clear obstruction.
	3) Operator in “Party Mode".	― Use Remote/SBC to resume normal operation.
	4) Constant Open Command (Check LED’s).	― Clear all Open/Safety devices from obstruction.
Accessory device not working properly	1) Not installed properly.	― Check for proper installation of accessory.
	2) Enabling Switch not turned on.	― Turn applicable switches on.
	3) Loose/disconnected wires.	― Check proper installation of wires.
	4) Bad accessory device	― Replace accessory device.

Chamberlain LA500 garage door opener troubleshooting

The Chamberlain LA500 an LA500-S models are intended for vehicular swing gates only. They were created for use in Class I-IV applications. According to the manufacturer, the LA500 and LA500-S models shouldn’t be used in pedestrian passage gates. Installation of these gate operators requires a professional tech.

Fault	Possible causes	Corrections
Operator does not run and diagnostic LED not on.	a) No power to control board	a) Check AC and battery power
	b) Open fuse	b) Check fuses
	c) If on battery power only, low or dead batteries	c) Charge batteries by AC or solar power or replace batteries
	d) Defective control board	d) Replace defective control board
Control board powers up, but motor does not run.	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Reset button is stuck	b) Check Reset button
	c) Stop button octive	c) Check Stop button is not "stuck on'
	d) If on battery power only, low or dead batteries	d) Charges batteries by AC or solar power or replace batteries
	e) Open or Close input active	e) Check all Open and Close inputs for a 'stuck on" input
	f) Entrapment Protection Device active	f) Check all Entrapment Protection Device inputs for a "stuck on" sensor
	g) Vehicle loop detector or probe active	g) Check all vehicle detector inputs for a "stuck on' detector
	h) Defective control board	h) Replace defective control board
Relay clicks with command, but motor does not turn on.	a) Arm jammed or not connected	a) Disengage the arm and ensure arm moves freely
	b) Defective motor or motor wires	b) Inspect motor wires for open wire, shorted wires, damage, etc. Else, replace arm.
	c) Defective control board	c) Replace defective control board.
Arm moves, but cannot set correct limits.	a) Arm does not extend or retract enough during travel	a) Disengage the arm and ensure arm moves freely
	b) Arm is interfering with mounting bracket	b) Examine the hinge point where the arm mounts to the gate post. Make sure that the arm housing does not hit or interfere with the gate post or mounting bracket. Correct as necessary.
	c) Gate is too difficult to move	c) Disconnect arm from gale and move gate manually. Gate must move easily and freely through its entire range, limit-to-limit. Repair gate os needed.
Gate does not fully open or fully close when setting limits.	a) Arm does not extend or retract enough during travel	a) Disengage the arm and ensure arm moves freely
	b) Arm is interfering with mounting bracket	b) Examine the hinge point where the arm mounts to the gate post. Make sure that the arm housing does not hit or interfere with the gate post or mounting bracket. Correct as necessary.
	c) Gate is too difficult to move	c) Remove arm from gale and move gate manually. Gate must move easily and freely through its entire range, limit-to-limit. Repair gate os needed.
Operator does not respond to a wired control/command (example: Open, Close, SBC, etc.)	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Check Open and Cose command input LEDs	b) Check all Open and Close inputs for a 'stuck on' input
	c) Stop button is active	c) Check Stop button is not "stuck on'
	d) Reset button is stuck	d) Check Reset button
	e) If on battery power only, low or dead batteries	e) Charges batteries by AC or solar power or replace batteries
	f) Entrapment Protection Device active	f) Check all Entrapment Protection Device inputs for a "stuck on' sensor
	g) Vehicle loop detector or vehicle probe active	g) Check all vehicle detector inputs for a "stuck on' detector
	h) Defective control board	h) Replace defective control board
Operator does not respond to a wireless control or transmitter	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Check XMITTER LED when wireless control is octive	b) Activate wireless control and check XMITTER LED is on. Re learn wireless control/ transmitter to control board. Reploce wireless control as needed.
	c) Stop button ‘is active	c) Check Stop button is not "stuck on'
	d) Reset button is stuck	d) Check Reset button
	e) Poor radio reception	e) Check if similar wired control operates correctly. Check if wireless controls works properly when within a few feet of operator. Check operator's antenna and antenna wire. Check other wireless controls or devices.
	f) Defective control board	f) Replace defective control board
Gate stops during travel and reverses immediately.	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Inherent force obstruction detection	b) Check for obstruction in gate's path or travel. Remove arm from gate and move gate manually. Gate must move easily and freely through its entire range, limit-to-limit. Remove obstruction or repair gate os needed.
	c) External Entrapment Protection Device activation	c) Check all Entrapment Protection Device inputs for an active sensor
	d) Control (Open, Cose) becoming octive	d) Check all Open and Close inputs for an active input
	e) Vehicle loop detector active	e) Check all vehide detector inputs for an active detector
	f) Low battery voltage	f) Battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries
Gate opens, but will not dose.	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Open control active	b) Check all Open inputs for an active input
	c) Close Entrapment Protection Device octive	c) Check all Entrapment Protection Device inputs for an active sensor
	d) Vehicle loop detector active	d) Check all vehide detector inputs for an active detector
	e) Loss of AC power with AC FAIL set to OPEN	e) Check AC power and AC Fail option setting
	f) Low battery with LOW BAH set to OPEN	f) Battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries
	g) Fire Dept input active	g) Check Hre Dept input
Gate doses, but will not open.	o) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Open Entrapment Protection Device active	b) Check all Entrapment Protection Device inputs for an active sensor
	c) Vehicle loop detector active	c) Check all vehide detector inputs for an active detector
	d) Low battery with LOW BATT switch set to close	d) Battery voltage must be 22.0 Vdc or higher
	e) Low battery with LOW BATT option set to CLOSE	e) Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or reploce batteries
Gate does not dose from Timer-to-Close.	a) Timer-to-Close not set	a) Check Timer-to-Qose (TTC) setting
	b) Open control active	b) Check all Open inputs for an active input
	c) Close Entrapment Protection Device octive	c) Check all Entrapment Protection Device inputs for an active sensor
	d) Vehicle loop detector active	d) Check all vehide detector inputs for an active detector
	e) Loss of AC power with AC FAIL set to OPEN	e) Check AC power and AC Fail option setting
	f) Low battery with LOW BATT option set to OPEN	f) Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or reploce batteries.
	g) Fire Dept input active	g) Check Hre Dept input
Vehide Exit loop activation does not cause gate to open.	o) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Exit vehicle detector setup incorrectly	b) Review Exit loop detector settings. Adjust settings as needed.
	c) Defective Exit loop detector or loop wire	c) Check Exit loop wire. Replace defective Exit loop detector.
	d) Low battery with LOW BATT option set to CLOSE	d) Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or reploce batteries.
Vehide Interrupt loop does not cause gate to stop and reverse.	a) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Vehicle detector setup incorrectly	b) Review Interrupt loop detector settings. Adjust settings as needed
	c) Defective vehide loop detector or loop wire	c) Check Interrupt loop wire. Replace defective Interrupt loop detector
Vehide Shadow loop does not keep gate at open limit.	o) Check DIAGNOSTIC LEDs	a) Use Diagnostic code to identify issue
	b) Vehicle detector setup incorrectly	b) Review Shadow loop detector settings. Adjust settings as needed
	c) Defective vehide loop detector or loop wire	c) Check Shadow loop wire. Reploce defective Shadow loop detector
Obstruction in gates path does not cause gate to stop and reverse	a) Force setting too high	a) Adjust force setting. Retest that obstruction in gate's path causes gate to stop and reverse direction.
Photoelectric sensor does not stop or reverse gate.	a) Incorrect photoelectric sensor wiring	a) Check photoelectric sensor wiring. Retest that obstructing photoelectric sensor causes moving gate to stop, and may reverse direction.
	b) Defective photoelectric sensor	b) Replace defective photoelectric sensor. Retest that obstructing photoelectric sensor causes moving gate to stop, and may reverse direction.
Edge Sensor does not stop or reverse gate.	a) Incorrect edge sensor wiring	a) Check edge sensor wiring. Retest that activating edge sensor causes moving gate to stop and reverse direction.
	b) Defective edge sensor	b) Replace defective edge sensor. Retest that activating edge sensor causes moving gate to stop and reverse direction.
Alarm sounds for 5 minutes or alarm sounds with a command.	a) Double entrapment occurred	a) Check for cause of entrapment (obstruction) detection and correct. Press the reset button to shut off alarm and reset the operator.
Alarm beeps three times with a command.	a) Low battery	a) Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or reploce batteries
On dual-gate system, one gate is not commanding the other.	a) Defective or incorrect Operator-to-Operator wiring	a) Check operator-to-operator wiring.
	b) Incorrect Operator-to-Operator wireless learning	b) Relearn the wireless network of one operator to the other operator.
On dual-gate system, incorrect gate opens first or closes first. Alarm beeps when running.	a) Incorrect Bipart switch setting	o) Change setting of both operator's Bipart switch settings. One operator should have Bipart switch ON (operator that opens first) and the other operator should have Bipart switch OFF (operator that opens second)
Expansion board function not controlling gate.	a) Defective main board to expansion board wiring	a) Check main board to expansion board wiring. If required, replace wire cable.
	b) Incorrect input wiring to expansion board	b) Check wiring to all inputs on expansion board.
	c) Defective expansion board or defective main board	c) Reploce defective expansion board or defective main board
Maglock not working correctly.	a) Moglock wired incorrectly	a) Check that Moglock is wired to N.O. and COM terminals. Check that Maglock has power (do not power moglock from control board occessory power terminals). If shorting lock's NO and COM wires does not activate Moglock, then replace Maglock or Maglock wiring
Solenoid lock not working correctly.	a) Solenoid wired incorrectly	a) Check that Solenoid is wired to N.C. and COM terminals. Check that Solenoid has power (do not power solenoid from control board occessory power terminals). If shorting lock's NC and COM wires does not activate Solenoid, then replace Solenoid lock or Solenoid wiring
Switched (SW) Accessory power remaining on.	a) Main control board is not going to low power mode.	a) Photoelectric sensor inputs may be active.
Accessories connected to Switch (SW) Accessory power not working correctly, turning off, or resetting.	a) Main control board is going to low power mode.	a) With expansion board disconnected and running on batteries (no AC power or solar power available), main board will go into low power mode. Move accessory power to Accy Power ON terminals (+, -). Connect expansion board to prevent low power mode.
Accessories connected to Accessory power not working correctly, turning off, or resetting.	a) Accessory power protector active	a) Disconnect all occessory powered devices and measure accessory power vohoge (should be 23 30 Vdc). If voltage is correct, connect accessories one at a time, measuring accessory voltage after every new connection.
	b) Defective control board	b) Replace defective control board
Quick Close not working correctly.	a) Quick Close setting incorrect	a) Check that Quick Close setting is ON
	b) Interrupt loop detector or loop wire defective	b) Check operation of Interrupt Loop detector
	c) Defective Expansion board	c) Reploce defective Expansion board
Anti-Tailgating not working correctly.	a) Anti-Tail setting incorrect	a) Check that Anti-Tail setting is ON
	b) Interrupt loop detector or loop wire defective	b) Check operation of Interrupt Loop detector
	c) Defective Expansion board	c) Replace defective Expansion board
AUX Relay not working correctly.	a) AUX Relay setting incorrect	a) Check AUX Relay switches settings
	b) AUX Relay wiring incorrect	b) Check that wiring is connected to either N.O. and COM or to N.C. and COM.
	c) Defective Expansion board	c) Set AUX Relay to another setting and test. Reploce defective expansion board.

Chamberlain PowerLift Elite CS45EVO garage door opener troubleshooting

Chamberlain PowerLift Elite CS45EVO is a garage door opener intended for use on sectional garage doors. It utilizes a chain drive with one-piece trolley on steel rail. Outside keyswitch, keyless entry system, and a remote control transmitter are some of the characteristic features of this model.

Problems	Solutions
1. Opener doesn't operate from either door control or remote:	• Does the opener have electric power? Plug lamp into Outlet. If it doesn't light, check the fuSe box Or the circuit breaker. (Some outlets are controlled by a wall switch.) • Have you disengaged all door locks? • Is there a build-up of ice or snow under door? The door may be frozen to ground. Remove any obstruction. • The garage door springs may be broken. Have it replaced.
2. Door operates from door control but not from remote:	• Replace batteries in the remote if necessary. • If you have two or more remotes and only one operates, review Program Your Opener, Remote and Keyless Entry.
3. Remote has short range:	• Replace batteries in the remote if necessary. • Change the location of the remote control in the car. • A metal garage door, foil-backed insulation or metal siding will reduce the transmission range.
4. Door reverses for no apparent reason and opener light flashes 10 times:	• Check The Protector System™ (if you have installed this accessory). If the IR Beam light is flashing, correct alignment. If the Protector System™ is installed and needs to be removed, the Opener will need to be reprogrammed as follows: • Remove the IR Beam wiring from the Opener • Turn the power OFF for 5 seconds • Turn the power ON for 5 seconds • Again turn the power OFF for 5 seconds • Turn the power back on and test the opener for normal operation.
5. The garage door opens and closes by itself:	• Make sure remote push button is not stuck "on". • Delete all transmitter codes to eliminate possible faulty remotes. • Reprogram and test each remote to the opener individually as per Wireless Programming Section.
6. Door stops but doesn't close completely:	Repeat Programming the Travel Limits. Repeat safety reverse test after any adjustment of door arm length, close force or down limit adjustments.
7. Door opens but won't close:	• Check The Protector System™ (if you have installed this accessory). If the light on the Beams are flashing, correct the alignment. • If opener light does not flash and it is a new installation, repeat Programming the Travel Limits. Repeat the safety reverse test after the adjustment is complete.
8. Opener strains:	Door may be unbalanced or springs are broken. Close door and use manual release rope and handle to disconnect trolley. Open and close door manually. A properly balanced door will stay in any point of travel while being supported entirely by its springs. If it does not, call for professional garage door service to correct the problem.
9. Opener hums briefly, then won't work:	• Garage door springs are broken. • If problem occurs on first operation of opener, door is locked. Disable door lock. Repeat safety reverse test after adjustment is complete.
10. Opener won't activate due to power failure:	• Pull manual release rope and handle down to disconnect trolley. Door can be opened and closed manually. When the power is restored, the next time the opener is activated, the trolley will re-connect. • The Outside Quick Release accessory (if fitted) disconnects the trolley from outside the garage in case of power failure.
11. The opener runs, but the carriage does not move:	• Check the carriage is not disengaged from the opener. Operate the opener to reengage the trolley. • In a new installation, the preassembled Motor Shaft Adapter may have fallen out of the chain sprocket assembly. This adapter is installed during the manufacturing process and may have dislodged.

Chamberlain RSL12V garage door opener troubleshooting

The Chamberlain RSL12V model of garage door opener, like its RSL12VH version, was created for vehicular slide doors. It is accompanied by a solar panel kit (10 WATT) giving you a chance to replace or add a solar panel to the operator application. You may connect up to 3 solar panels to the RSL12V garage door opener.

Continuous flashes (heartbeat) power on	Operator is in sleep mode Normal – Operation
2 flashes stop not connected	Stop is not connected.
	• Party Mode moy be activated.
	• Check to make sure the jumper wire is connected between the COM and STOP input on the control board. Stop is an NC (normally closed) input.
3 flashes low battery voltage	Battery voltage is below the recommended operating level.
	• Battery may not be property charged. Disconnect all batteries and make sure AC power or solar power rs connected. Verify AC power outlet.
	• Verify that the battery fuses are intact and not blown. Reploce blown fuses with same type and rating.
	• Batteries are no longer capable of holding a charge due to age or excessive depleting of the battery. Replace the batteries. Dispose of old batteries properly.
4 flashes low battery capacity	Battery does not have the capacity to operate the gate operator.
	• Battery may not be properly charged. Disconnect all batteries and make sure AC power or solar power rs connected. Verify AC power outlet.
	• Verify that the battery fuses are intact and not blown. Reploce blown fuses with same type and rating.
	• Batteries are no longer capable of holding a charge due to age or excessive depleting of the battery. Replace the batteries. Dispose of old batteries properly.
5 flashes rpm reversal gate 1 or in manual release mode. Wiring to the operator is disconnected or damaged	Gate 1 has encountered an obstruction or the wiring is disconnected, damaged or miswired.
	• Make sure the path of the gate is clear and the gate moves freely.
	• Incorrect or bod connection to Gate 1. Check the green and white wires on the motor to make sure connections are correct and secure.
	• Bad control board.
6 flashes force reversal gate 1	Gate 1 has encountered an obstruction.
	• Make sure the path of the gate is clear and the gate moves freely.
	• If there is no obstruction the force adjustment is set too low. Increase the force setting and verify that the gate moves without reversing and will reverse if on obstruction is encountered.
7 flashes rpm reversal gate 2 or wiring to the operator is disconnected or damaged	Gate 2 has encountered an obstruction or the wiring to the motor is disconnected, damaged or miswired.
	• Make sure the path of the gate is clear and the gate moves freely.
	• Incorrect or bod connection to Gate 2. Check the green and white wires on the motor to make sure connections are correct and secure.
	• Bad control board. Press the LEARN LIMITS button and press the GATE 2 buttons to move the gate. If the gate does not move continuously, disconnect the gate from Gate 2 and connect to the Gate 1 connector and repeat the attempt to move the gate. If the gate does not move continuously on either Gate 1 or 2, replace the control board.
8 flashes force reversal gate 2	Gate 2 has encountered an obstruction.
	• Make sure the path of the gate is clear and the gate moves freely.
	• If there is no obstruction the force adjustment is set too low. Increase the force setting and verify that the gate moves without reversing and will reverse if on obstruction is encountered.
9-11 flashes potential chip failure	Potential RAM, Flash, or EEPROM failure.
	• Turn power off and on.
	• If problem is not resolved by turning the power off and on, replace the control board.
Operator does not run. Diagnostic led not on.	• Power not connected. Make sure the AC/Solor input is connected and that at least one battery is connected with the corresponding fuse intact.
	• Low or defective battery. Check the battery to make sure that the red wire goes to the positive terminal of the battery and the black wire goes to the negative terminal of the battery. Replace the battery if the open circuit voltage is below 11.5 Vdc.
	• Bad control board. Replace control board.
Operator powers up but does not operate.	• Low or defective battery. At least one charged battery must be connected for the operator to operate. Verify the battery fuse is intact. Check battery connections and battery voltage to be above 11.5 Vdc. Replace batteries if necessary.
	• STOP button connection loose or disconnected. Toggle the RESET switch and verify that the STOP LED lights up and then turns off after 10 seconds. Verify the wire connects between the STOP and CTRL PWR terminals.
	• Obstruction blocking photoelectric sensors. Toggle the RESET switch and verify that all the safety LEOs (OPEN EDGE/PHOTO, OPEN PHOTO, CLOSE PHOTO) are OFF. If any are ON, clear any obstructions and verify the LED turns off.
	NOTC: The RESET switch may need to be toggled multiple limes since the LEOs turn oH alter 10 seconds when the operator goes
	to sleep.
	• (Optional Accessory) Safety edge is damaged or on an obstruction. Toggle the RESET switch and verify that the Safety LEDs (OPEN EDGE and CLOSE EDGE/PHOTO) are OFF. If either is ON, clear any obstructions and verify the LED turns off.
	NOTC: The RESET switch may need to be toggled multiple times since the LEDs turn olf alter 10 seconds when the operator goes
	to sleep.
	• (Optional Accessory) Interrupt loop is obstructed. Toggle the RESET switch and verify that the INTERRUPT LED is OFF. If it is on, check the loop detector and its wiring to ensure that it is not incorrectly being triggered.
	• Bad control board. Replace control board.
	• Battery not connected. At least one charged battery must be connected for the operator to operate. Verify battery fuse is intact. Check battery connections and battery voltage to be above 11.5 Vdc. Replace batteries if necessary.
	• Verify that all of the wires, especially the wires going to the motor are secure and that the connector is properly mated to the header.
Relays "click" when remote control or single button control (sbc) command is given, but the operator does not move or gate disconnected.	• The gate is jammed or incorrectly installed. Disconnect the gate and verify that the gate moves freely. Enter the Learn Limits mode and verify that the motor spins. Reconnect the gale. Reprogram limits for the operator.
	• Bad control board. Replace control board.
The gate moves but cannot exit learn limits mode. Cannot learn limits.	• Disconnect the operator from the gate and make sure that the gate moves freely throughout the full length of travel.
	• If the limits will not program:
	1. Disconnect the operator by pressing the reset switch to RESET/DISCONNECT.
	2. Manually close the gate.
	3. Remove the learn limit cover and move the learn limit nut to the center position.
	4. Press the reset switch to NORMAL OPERATION.
	Program the limits again.
Gate does not fully open or close when trying to learn limits.	• Gate is excessively heavy or wheels are bad. Verify that the gate is within the ratings for this product. Disconnect the operator(s) and verify that the gate(s) slide easily.
	• Check the brown and green wires on J17 to ensure they are properly connected. If this did not solve the problem the RPM Module or control board may need to be replaced. Contact technical support.
Operator does not respond to single button control (sbc) command.	• Battery not connected. At least one charged battery must be connected for the operator to operate. Verify the battery fuse is intact. Check battery connections and battery voltage to be above 11.5 Vdc. Replace batteries if necessary.
	• STOP button connection loose or disconnected. Toggle the RESET switch and verify that the STOP LED lights up and then turns off after 10 seconds. Verify the wire connects between STOP and CTRL PWR terminals.
	• Single Button Control (SBC) button connection loose. Check wiring for SBC button. Use the on board single button to verify operator will respond.
	• Bad control board. Replace control board.
Operator does not respond to command.	• Battery not connected. At least one charged battery must be connected for the operator remote control to operate. Verify battery fuse is intact. Check battery connections and battery voltage to be above 11.5 Vdc. Replace batteries if necessary.
	• STOP button connection loose or disconnected. Toggle the RESET switch and verify that the STOP LED lights up and then turns off after 10 seconds. Verify the wire connects between the STOP and CTRL PWR terminals.
	• Radio module not plugged in. Verify the green Radio module (located next to the coaxial connector) is properly mated with both 4-pin connectors.
	• If the operator is not grounded properly the range of the remote controls will be reduced. Ensure operator is properly grounded.
Operator does not respond to command.	• Antenna not connected. Verily the antenna and coaxial cable are properly connected to the control board.
	• Remote control not programmed.
	• Bad control board. Replace control board.
Gate stops and reverses immediately after it starts moving.	• Obstruction sensed. Check safety devices and gate for obstructions.
	• A fault has occurred. Check Diagnostic LED for possible error codes.
	• Force set too low. Adjust FORCE setting until gate completes a full open/dose cyde without reversing. The force setting may need to be adjusted in cold weather, as the gate will not move freely.
	• Low or defective battery. At least one charged battery must be connected for the operator to operate. Verify battery fuse is intact. Check battery connections and battery voltage to be above 11.5 Vdc. Replace battery if necessary.
Gate opens but does not close.	• An open input is continuously activated. Check the open loop or vehicle probe to make sure they are clear of objects. Verify connections and operation for these devices.
	• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if necessary.
	• (Optional Accessory) Entry system output is connected to the OPEN input, and is "stuck' opening. Verify entry system connections and operations.
	• Obstruction blocking close photoelectric sensors or safety loop. Check photoelectric sensors lot alignment and verify all connections and operation for safety devices.
	• (Optional Accessory) Close safety edge is damaged or on an obstruction. Verify operation and connection of close edge.
Gate does not close automatically with timer to close enabled.	• Verify that the Timer-to-Close is ON and adjusted to desired delay.
	• Gate opened by a force obstruction reversal. Check the Diagnostic LED and clear gate path of any obstructions.
	• The Interrupt loop is obstructed (optional accessories).
	• Obstructed dose photoelectric sensor or edge (optional accessory). Check connections and operations of safety devices.
	• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc Replace battery if necessary.
Alarm constantly sounds 5 minutes. Sounds whenever a command is issued.	• An open input is continuously activated. Check the open loop or vehicle probe to make sure they are clear of objects. Verify connections and operation for these devices.
	• (Optional Accessory) Entry system output is connected to the OPEN input, and is "stuck' opening. Verify entry system connections and operation.
	• Operator in Party mode after RESET switch is toggled while at the OPEN limit. Use a remote control or the SINGLE BUTTON to close the gate and reopen it. Verify that the TIMER RUNNING LED is flashing.
	• Double entrapment occurred. Two successive obstructions were encountered while moving the gale. Toggle the RESET switch and ensure that the gale path is dear of all obstructions. Check the FORCE setting to make sure it is properly set.
Alarm is beeping 3 Times on a Command gate Runs too slow.	• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if necessary.
	• Open and Close Limits are set too close together. If the Open and dose Limits are set within the ramp down distance of each other, the gate will run at slow speed all the time.
	• The gale is starting within the ramp down distance from the Open or Close Limit. Gale will run slow to limits if motion is started within the ramp-down distance from the limit.
Gate 2 closes Before gate 1.	• Lock/Bipart Delay not set. Slide the Lock/Bipart Delay switch to ON. Verify that Gale 1 starts moving first on open and last on close.
	• Gate is excessively heavy. Verify that the gate is within the ratings for this product. Disconnect the operator(s) and verify that both gate(s) operate easily. If the gate(s) are harder to move in one direction verses the other, the gate must be adjusted.
	• Gate is unbalanced. Disconnect the operator(s) and verify that gate(s) operate easily in both directions. If the gate(s) are harder to move in one direction verses the other, the gate must be adjusted.
	• Bad motor connection. Check the motor wires and connections for possible loose or corroded terminals.
Alarm beeps When running.	• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc Replace battery if necessary.

Chamberlain SL575 garage door opener troubleshooting

Chamberlain SL575 and SL575 LiftMaster Professional are heavy duty slide gate operators. They are equipped with 1/2 HP and 1 HP motors, as well as a solenoid actuated brake. The maximum cycle rate varies from 18 to 22 cycles per hour depending on the power of the motor.

Fault	Possible cause	Fix
Operator fails to run	1) Improper v/ired stop control	― Check the green LED (D17) on control board. If the green LED is off. check to make sure a stop control has been installed across terminals TB1-3 and TB1-5 of the terminal strip.
	2) Fault in the operator check the yellow diagnostic LED at the top right of the control board next to the programming dip switches.	― If the yellow LED blinks six times, there is a master/second unit communication failure. If operator is a single unit, make sure there is a jumper across terminals TB1-11 and TB1-12. If operator is in a dual gate configuration, make sure that the communication wiring between the two units is undamaged and complete.
		― If the yellow light is solid, the board needs to learn the motor.
	3) An accessory is active or malfunctioning check the red input status LEDs. D11-D31	― If any red LEDs are on. check the corresponding input. An installed accessory may be wired incorrectly or malfunctioning. Remove the accessory and test the operator.
	4) Improper J4 connector wiring (master/second)	― If the open or interrupt (safety) loop LED is on. make sure factory plug-in loop detectors are working properly and appropriate loops are installed on the loop input terminals. ― Stand-Alone Operators: Make sure there is a jumper installed across the J4 connector. ― Master/Second Operation: Make sure that the master/second wiring is installed correctly and is intact (not damaged).
	5) Low or no high voltage pov/er	― Verify power supply to operator. It should be within 5% of the operator's rating v/tien running. Make sure that the proper v/ire gauge v/as used for the distance between breaker and operator by consulting the wiring specifications section
	6) Low or no low voltage power	― Measure the voltage at terminals R1 and R2 in the operator. This voltage should be within 5% of 24Vac. If the high voltage power is good and the low voltage power is bad. check to make sure the circuit fuse is not tripped and that the correct primary tap is used on the transformer. If fuse and tap are correct, replace the transformer.
	7) No LEDs illuminated on the control board	― If both primary and secondary power is good, check to make sure that the J2 connector is making good contact with the pins on the control board. If all is good, replace the control board.
Contactor chatters when operator begins to move	1) Transformer's secondary is overloaded	― Remove all accessory devices and test the operator. If the contactor stops chattering, find an alternate pov/er source for some of the devices.
	2) Low primary (high voltage) pov/er	― Verify power supply to operator. It should be within 5% of the operator's rating v/tien running. Make sure that the proper v/ire gauge was used for the distance between breaker and operator by consulting the wiring specifications section
Operator runs slow and/or trips the internal overload	1) Low primary (high voltage) pov/er	― Verify power supply to operator as well as the meter base or sub panel. Make sure there is not a major change in voltage. The voltage at the operator should be within 5% of the operator's rating when running. ― Check the number of amps currently being drawn from the panel. Make sure that the total power being drawn does not exceed the panel's rating. ― Make sure that the proper wire gauge was used for the distance between breaker and operator by consulting the wiring specifications section
	2) Problem in the motor	― Perform a visual inspection of the motor. Examine the motor's labels for any distortion or signs of overheating. Replace the motor if it is humming, grinding or making excessive noise. NOTE: Repeated motor problems indicate poor primary power.
	3) Problem in the contactor	― Examine the contactor for sparking, smoke or burn marks. Remove the wires from one side of the contactor, then measure the contact points for high resistance (above 1 ohm). Replace the contactor.
	4) Problem in the brake system	― Make sure that the brake is disengaging when the contactor pulls in and engaging when the contactor releases. Replace solenoid.
Master or second operator is not functioning properly	1) Failure to cycle power after setup	― The pov/er to each unit must be cycled in order to initiate proper master/ second communication if the operators were previously in stand-alone mode.
	2) Communication wiring may be damaged or improperly wired for dual gate operation	― Make sure that the communication wire that is used is twisted pair and not run in the same conduit with any power wiring. Failure to do so v/ill result in interference across the master/second communication line.
	3) Master or second unit is not programmed correctly	― Review program settings and check both the master and second for proper programming.
	4) Master/second connection not properly grounded	― Review wiring detail for master/second systems
Operator runs in wrong direction	1) Operator's main power is out of phase (three phases only)	― Turn off the unit's main power at the breaker and swap any two power leads at the operator's main power switch. Apply power and retest the operator.
	2) Operation directional switch	― Check right/left operation switch. See DIP switch S1 programming setting.
Operator runs but then stops and reverses direction	1) Entrapment (force pot) incorrectly set	― This pot must be set so that the gate will run smoothly normally and reverse when encountering an obstruction.
	2) Gate is binding or not running smoothly	― Disengage the manual release and roll gate open and close by hand at normal operating speed. Make sure that the gate runs smoothly and does not bind. If the gate is hard to move or binds, repair the gate.
	3) Clutch is not adjusted properly	― Adjust the clutch so that the operator can move the gate throughout its travel without slipping but will slip when the gate hits an obstruction.
	4) Brake is not functioning properly	― Make sure that the brake operates correctly. The brake should disengage when the contactor activates and engage v/tien the contactor releases.
	5) Observe red LEDs D29 and D31	― Both LEDs will indicate the activation of entrapment protection devices on terminals TB1-9 and TB1-10 on the control board. Remove the devices and retest. If the operator now runs without fault, check those accessories as well as their wiring.
	6) RPM (Hall Effect) Sensor is not aligned	― Make sure that the sensor is adjusted so that it is centered over the limit shaft's magnet and is 10-15 thousandths of and inch (business card thickness) from the magnet. ― Replace the sensor if it is adjusted correctly but continues to fail.
Motor runs but gate does not move: operator stops and alarms	1) Operator's manual release is not aligned	― Make sure that the unit's manual release is not engaged. The unit's manual release, when engaged, will set off the entrapment if the gate is given a command to move.
	2) Clutch is not adjusted properly	― Adjust the clutch so that the operator can move the gate throughout its travel without slipping but will slip v/hen the gate hits an obstruction.
	3) V-Belt Slippage	― Check belt for excessive wear. Belt can be adjusted by loosening the (4) mounting bolts securing motor to the frame and sliding motor until belt is taut.
Operator opens immediately upon power up and does not close	1) Active or malfunctioning accessory check the red input status LEDs. D11-D13	― If any red LEDs are on. check the corresponding input. An installed accessory may be v/ired incorrectly or malfunctioning. Remove the accessory and test the operator. ― If the soft open or interrupt (safety) loop LED is on. make sure factory plug-in loop detectors are working properly and appropriate loops are installed on the loop input terminals.
Operator has trouble learning the motor	1) Operator's manual release is engaged	― Make sure the manual release is not engaged. The operator's manual release, v/hen engaged, will not allow the entrapment sensor to provide feedback to the control board v/tien the operator is moving.
Programming changes do not effect the gate	1) Check the save switch on switch S1-1	― If the switch S1-1 is in the on position, any subsequent programming changes will not affect the gate. To make programming changes, switch S1-1 off. make desired changes, and then switch S1-1 on.
Gate edge pauses gate when struck during opening	1) Open obstruction input is programmed incorrectly	― The open obstruction input has been programmed to function with photo eyes, not gate edges.
Gate does not activate timer to close after the close photo eye is broken	1) Close obstruction input is programmed incorrectly	― The close obstruction input has been programmed to function with gate edges, not photo eyes. Reprogram the obstruction inputs to match the accessories that are installed on operator.
Radio controls will not close the gate from the open limit	1) Radio terminals R1-4 are factory configured for commercial radio function	― Configure terminals R1-4 for residential radio for residential radio function by performing the following modifications: 1. Locate and disconnect the end of the wire running to terminal 6 (TB6) from R4. 2. Connect the end of the wire removed from terminal 6 (TB6) to terminal 1 (TB1).

Chamberlain SL3000UL garage door opener troubleshooting

The Chamberlain SL3000UL range of garage door openers is intended for professional installation only. The vehicular slide door operators are UL325 and UL991 compliant. The range includes single 1/2 HP motor models, dual 1/2 HP motor models, as well as 1 HP motor models. The maximum gate weight ranges from 800 lbs. for the SL3000ULDM version to 2000 lbs. for the SL3000UL1HPH opener.

Condition	Probable Causes	Solution
Overload LED ON and Power LED OFF	1. Short circuit at terminals 11 and 13.	1. Remove the short circuit condition at the terminals.
	2. Short circuit at any of the loop detectors in the board.	2. Remove the defective loop detector.
	3. Short circuit in the control board.	3. Send the board to repair.
Overload LED ON and Power LED ON	1. Excessive current draw at terminal 13.	1. Reduce the accessories load from surge suppressor terminal 13.
	2. Over-voltage at the 120Vac line input.	2. Verify your electrical pov/er.
System On LED Flashing	1. Motor thermal fuse has popped-out (Rapid Flashing).	1. Reset the motor.
	2. One limit switch is faulty (Rapid Flashing).	2. Test the limit switches and wire connections, fix the fault.
Reverse Sensor LED ON	1. Gate has encountered an obstruction during traveling.	1. Remove the obstruction.
	2. Reverse sensor is extra sensitive..	2. Turn the reverse sensor switch counter-clockwise a little more and try again.
Alarm Sensor LED ON	1. Gate encountered an obstruction during traveling.	1. Remove the obstruction.
	2. Alarm sensor is extra sensitive.	2. Turn the alarm sensor switch counter clockwise a little more and try again.
Command Processed LED ON	1. There is a command hold active.	1. This is a normal response of the gate operator. It does not represent necessarily that there is a problem.
Timer LED Blinking and Command Processed LED Blinking	1. There is a command holding the gate open.	1. This is a normal response of the gate operator. It does not represent necessarily that there is a problem. Check inputs for command.
Timer LED Blinking, Command Processed LED Blinking and Reverse Sensor LED ON	1. Gate has reopened because it encountered an obstruction while closing.	1. Any re-new command will resume normal operation. Check for obstructions.
Audio Alarm ON	1. Gate has encountered two consecutive obstructions while trying to close or open.	1. Any re-new command will resume normal operation but not a radio command. Check for obstructions. 2. You can stop the alarm by using the built-in reset button. 3. You can stop the alarm by using an optional stop button.
Any Loop LED ON and No vehicle on the sensing area	1. The loop detector needs to be reset.	1. Reset the loop detector (If you use Elite Plug-in Loop detectors, change the setting for sensitivity and come back to your original setting).
	2. The wire loop has been disrupted.	2. Verify and correct connections.
	3. The loop detector needs to work in a different frequency.	3. Set a different working frequency.
	4. The loop detector is too sensitive.	4. Decrease the sensitivity of the loop detector.

Chamberlain SW470 garage door opener troubleshooting

The SW470 model is a medium duty gate operator created for vehicular swing gates. It is powered by a 1/2 HP motor. The Chamberlain opener, which, according to the manufacturer, requires professional installation, can be used for gates with the maximum weight of 500 lbs. and the maximum width of 12 ft. It may be used in Class I-IV applications.

Symptom	Possible Cause	Remedy
Motor does not run when OPEN or CLOSE button is pressed.	Building fuse blown or circuit breaker tripped	Replace fuses or reset breaker and check for cause.
	Overload protector tripped.	Reset and check for cause.
	Control circuit not functioning.	Check transformer secondary voltage. Check contactor coils for possible burnout. Check limit switches. Inspect control station and all field wiring.
Gate closes when OPEN button is pressed and limit switches do not function.	Three phase power supply is connected out of phase.	Interchange any two incoming power supply leads.
	R.H./L.H. program.	R.H./L.H. programming.
Operator does not shout off at fully opened or closed position.	Limit nuts not properly adjusted.	Set the Limit
	Limit switch damaged.	Check limit switch operation and replace if necessary.

Chamberlain T garage door opener troubleshooting

Chamberlain T is an industrial duty door operator, which may be powered by a variety of motors (1/3, 1/2, 3/4 or 1 HP). Like many other commercial models manufactured by Chamberlain, the T garage door opener boasts a so-called Maintenance Alert System. Provided you set an internal maintenance cycle counter, the system will inform you in case the opener needs immediate attention.

Symptom	Probable cause	Resolution
Each open command will open the door about a foot and a half then stop, after reaching the open limit each close command will close the door about a foot and a half then reverses back to full open.	RPM sensor is not adjusted correctly.	Reset the RPM sensor. Also verify that the software is version 260 or better. Order replacement chips from Parts and Service.
The door will open some but not completely. And the door will close some and not completely. Extra commands are able to get the door to move completely	The Maximum run timer is not set correctly.	Reset the Maximum Run Timer
The door will open some but not completely. An extra open command is able to get the door to open completely	There may be a Mid Stop set.	Reset the mid-stop by programming it to be at the open limit.
The door will open but will only close after a 5 second delay with constant pressure on the close button.	a) The Photo Eyes, edge or other sensing device is obstructed or activated.	a) Remove the obstruction, check the safety device wires for continuity and shorts.
	b) The Logic board thinks that the direct connect photo eyes are attached and blocked	b) Unlearn the photo eyes from the memory. Also verify that the Logic Board Chip is Version 260 or better. Order replacement Chips from Parts and Service.
The operator will not respond to any commands	a) Operator control station is wired wrong	a) Use the LEDs to help check correct wiring Verify that the board is accepting commands by using the onboard control station.
	b) Motor is malfunctioning	b) Verify voltage getting to the motor.

Chamberlain WD962KCD garage door opener troubleshooting

The Chamberlain WD962KCD garage door opener was created exclusively for residential use. The manufacturer calls it a “Whisper Drive Security+” model. It is a rather popular door opener provided with a battery backup feature, that allows you to use the device when electric power goes off.

Problems	Solutions
Мy door will not close and the light bulbs blink on my motor unit	The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction. • Verify the safety reversing sensors are properly installed, aligned and free of any obstructions. • Check diagnostic LED for flashes on the motor unit
My remotes will not activate the door:	• Verify your Motion Detecting Control Console is not blinking. If it is blinking, deactivate the Lock Mode following the instructions for Using the Wall Mounted Control Console. • Reprogram remotes following the programming instructions. • If remote will still not activate your door, check diagnostic LED for flashes on motor unit
My door reverses for no apparent reason	Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel. • Manually check door for balance or any binding problems.
My door reverses for no apparent reason after fully closing and touching the floor	Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel.
My lights will not turn off when door is open	• The garage door opener is equipped with a security light feature. This feature activates the light on when the safety reversing sensor beam has been obstructed.
My motor unit hums briefly	• First verify that the trolley is against the stop bolt. • Release the door from the opener by pulling the Emergency Release Rope. • Manually bring the door to a closed position. • Loosen the belt by adjusting the outer nut 4 to 5 turns. This relieves the tension. • Run the motor unit from the remote control or control console. The trolley should travel towards the door and stop. If the trolley re-engages with the door, pull the Emergency Release Rope to disengage. • Decrease the UP travel by turning the UP Travel adjustment screw 2 full turns away from the arrow. • Re-Tighten the outer nut until the trolley spring is approximately 1-1/4" (3.18 cm) in length. • If the trolley does not move away from the bolt, repeat the steps above.
Battery status LED is not lit properly	• Check battery connections.
1 flash Safety reversing sensors wire open (broken or disconnected). OR 2 flash Safety reversing sensors wire shorted or black/white wire reversed.	Symptom: One or both of the Indicator lights on the safety reversing sensors do not glow steady. • Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires reversed), broken or disconnected wires, replace/attach as needed. • Disconnect all wires from back of motor unit. • Remove sensors from brackets and shorten sensor wires to 1-2 ft (30-60 cm) from back each of sensor. • Reattach sending eye to motor unit using shortened wires. If sending eye indicator light glows steadily, attach the receiving eye. • Align sensors, if the indicator lights glow replace the wires for the sensors. If the sensor indicator lights do not light, replace the safety reversing sensors.
3 flash Control console or wire shorted.	Symptom: LED is not lit on control console. • Inspect control console/wires for a short (staple in wire), replace as needed. • Disconnect wires at control console, touch wires together. If motor unit activates, replace control console. • If motor unit does not activate, disconnect control console wires from motor unit. Momentarily short across red and white terminals with jumper wire. If motor unit activates, replace control console wires.
4 flash Safety reversing sensors slightly misaligned (dim or flashing LED).	Symptom: Sending indicator light glows steadily, receiving indicator light is dim or flashing. • Realign receiving eye sensor, clean lens and secure brackets. • Verify door track is firmly secured to wall and does not move.
5 flash Possible RPM sensor failure. Unplug to reset.	Symptom: HPM Sensor Short travel 6-8 (15-20 cm). • Unplug unit to reset. Try to operate motor unit, check diagnostic code. • If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace RPM sensor. • If motor unit doesn’t operate, motor unit is overheated. Wait 30 minutes and retry. If motor unit still will not operate replace logic board.

Chamberlain myq garage door opener troubleshooting

Problem	Solution
If the Internet Gateway’s green LED is not illuminated or blinking, the Internet Gateway is not connected to the Internet.	There are a few different reasons an Internet Gateway will not successfully connect to the Internet: • An incompatible router • A router configuration setting (e.g. MAC address filtering) • A network security appliance (firewall)
Green LED on the Internet Gateway is off The router is not providing an IP address to the Internet Gateway.	Verify power to the Internet Gateway. Disconnect and reconnect power to the Internet Gateway. Blue and green LEDs should blink on and off a few times when the Internet Gateway is initially powered. Check the Ethernet cable connections between the Internet Gateway and router or network switch. Confirm the router is operating. Check if the router is incompatible with the Internet Gateway. Go to LiftMaster.com/MvQ-CD03in6 look for the Commercial Door ODerator MvQ Incompatible Router and Switch Guide. Connect the Internet Gateway to a different LAN port on the router. Determine if a router setting is preventing the Internet Gateway from obtaining an IP address (e.g. MAC address filtering, firewall settings). • Review the router’s settings and manual. • Router must be set to DHCP to provide an IP address to the Internet Gateway. • The Internet Gateway requires UDP port 80 to have a UDP timeout of 180 sec or greater. Reset the router. Disconnect power to the router for 30 seconds. Reconnect power to the router. Wait up to 5 minutes after the router is active to determine if the green LED on the Internet Gateway is illuminated solid or blinking.
Green LED on the Internet Gateway is blinking If the green LED on the Internet Gateway is blinking, the Internet Gateway has obtained an IP address from the router, but the Internet Gateway is not connecting to the MyQ Server.	Determine if a router setting (e.g. firewall setting) is preventing the Internet Gateway from communicating with the Internet. • Review the router’s settings and manual. • The Internet Gateway requires UDP port 80 to have a UDP timeout of 180 sec or greater. Determine if a network security appliance (firewall, e.g. SonicWALL®, ZyWall) is installed. • Determine if the network security settings are preventing connection of the Internet Gateway to the Internet. • The Internet Gateway requires UDP port 80 to have a UDP timeout of 180 sec or greater. SonicWALL®’s UDP timeout must be adjusted to be 180 sec or longer for both inbound and outbound data traffic.
The problems listed above are caused by SonicWALL’s factory default UDP connection timer being set to 30 seconds which closes the Internet Gateway connection to the server after the Internet Gateway enters its sleep state and reduces communication to the server to once every 60 seconds. When this occurs, the Internet Gateway will take up to 2 minutes to recognize the connection to the server is lost before trying to re-establish connection. The process will continue to repeat. When a MyQ device is behind a SonicWALL Network Appliance, the following MyQ app performance issues may occur: 1. Difficulty controlling a MyQ device through the MyQ app. 2. Manual operation of a MyQ device may not change state on the MyQ app (commercial door is closed by pressing wall control, but app shows door open). 3. Upon power cycling of an Internet Gateway the app will work for a brief period of time and then enter a non-working state.	The SonicWALL UDP connection timer should be changed to 120 seconds or greater. LiftMaster recommends a minimum value of 180 seconds. The timer must be changed in multiple locations. 1. The default UDP timer should be changed, which will change the UDP connection timer for any new rule made to the SonicWALL. 2. Any current LAN -> WAN rules must have the UDP connection timeout updated manually. Set “Defualt UDP Connection Timeout (seconds):” to “360" and set “UDP Connection Inactivity Timeout (seconds):" to “360”.
Unable to add a MyQ Enabled Commercial Door Operator to a MyQ account.	1. Confirm the Internet Gateway is powered and the green LED illuminated and solid. 2. Confirm the Internet Gateway is added to the MyQ account. 3. Confirm the MyQ device is in the programming/learn mode. 4. Confirm the signal from the Internet Gateway can reach the MyQ enabled commercial door operator. Depending on obstructions the average range from the Internet Gateway is between 300 to 600 feet. Are there too many walls between the Internet Gateway and the commercial door opener or lighting device? To test a MyQ enabled commercial door operator, program a remote control to the operator and stand near the Internet Gateway. Test if a remote control can operate the MyQ enabled commercial door operator. If necessary relocate the Internet Gateway closer to the MyQ enabled commercial door operator using a longer CAT5 cable or higher quality Ethernet cable (up to 100 feet). 5. Confirm the antenna is installed on the commercial door operator. The antenna is included inside a poly bag on the operator cover along with the installation manual, user guide and quick start guide. 6. MyQ enabled devices communicate using a 900 MHz radio signal. Electronic devices in the same area of the Internet Gateway or MyQ devices may create a range issue. Some troubleshooting options include powering down or relocating other 900 MHz products (900 MHz cordless phone, etc.) in the area of the MyQ device causing the interference.
The MyQ Enabled Commercial Door Operator will not respond to the app.	1. Confirm the green LED on the Internet Gateway is illuminated and solid. If the green LED is not illuminated or blinking, see Connection Issues. 2. For a MyQ enabled commercial door operator, confirm that the operator is powered up and fully operational. Control the MyQ enabled commercial door operator from a remote control or wall-mounted door control. 3. Confirm the MyQ enabled commercial door operator is set to a wiring type which allows control of the operator from the MyQ App: B2, T, TS, and FSTS - will open and close the door C2 and E2 - will open but will not close the door D1 - will not open or close the door NOTE: If a MyQ enabled commercial door operator is programmed with a mid-stop. The MyQ app will open a fully closed door to the mid stop. The MyQ app will update and show the MyQ enabled commercial door in the mid-stop position. The next MyQ app command will close the MyQ enabled commercial door. 4. Confirm the MyQ enabled commercial door operator has been added to the MyQ account (a commercial door image should be present on the Places screen of the app). 5. Confirm the signal from the Internet Gateway can reach the MyQ enabled commercial door operator. Depending on obstructions the average range from the Internet Gateway is between 300 to 600 feet. Are there too many walls between the Internet Gateway and the commercial door opener or lighting device? To test a MyQ enabled commercial door operator, program a remote control to the operator and stand near the Internet Gateway. Test if a remote control can operate the MyQ enabled commercial door operator. If necessary relocate the Internet Gateway closer to the MyQ enabled commercial door operator using a longer CAT5 cable or higher quality Ethernet cable (up to 100 feet). 6. MyQ devices communicate using a 900 MHz radio signal. Electronic devices in the same area of the Internet Gateway or MyQ enabled commercial door operator may create a range issue. Some troubleshooting options include powering down or relocating other 900 MHz products (900 MHz cordless phone, etc.) in the area of the MyQ enabled commercial door operator causing the interference.

Chamberlain Professional Security+ 3280M garage door opener troubleshooting

Problem:	Solution:
My door will not close and the light bulbs blink on my motor unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction:	Verify the safety sensors are properly installed, aligned and free of any obstructions
	Check diagnostic LED for flashes on the motor unit
My remotes will not activate the door:	Verify your door control is not blinking. If it is blinking, deactivate the Lock Mode following the instructions for Using the Wall Mounted Door Control
	Reprogram remotes following the programming instructions
	If remote will still not activate your door, check diagnostic LED for flashes on motor unit
My door reverses for no apparent reason: Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel	Manually check door for balance or any binding problems
My door reverses for no apparent reason after fully closing and touching the floor	: Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel
My lights will not turn off when door is open	The garage door opener is equipped with a security light feature. This feature activates the light on when the safety sensor beam has been obstructed. Using the Wall Mounted Door Control, Light Feature
My motor unit hums briefly	First verify that the trolley is against the stop bolt
	Release the door from the opener by pulling the Emergency Release Rope
	Manually bring the door to a closed position
	Loosen the belt by adjusting the outer nut 4 to 5 turns
	Run the motor unit from the remote control or door control. The trolley should travel towards the door and stop. If the trolley re-engages with the door, pull the Emergency Release Rope to disengage

Access Master Security+ M385 Garage Door Opener Troubleshooting

DIAGNOSTIC CODE Up arrow Flash(es)	DIAGNOSTIC CODE Down arrow Flash(es)	SYMPTOM	SOLUTION
1	1	The garage door opener will not close and the light bulbs flash.	Safety sensors are not installed, connected, or wires may be cut. Inspect sensor wires for a disconnected or cut wire.
1	2	The garage door opener will not close and the light bulbs flash.	There is a short or reversed wire for the safety sensors. Inspect safety sensor wire at all staple and connection points, replace wire or correct as needed.
1	3	The door control will not function.	The wires for the door control are shorted or the door control is faulty. Inspect door control wires at all staple and connection points, replace wire or correct as needed.
1	4	The garage door opener will not close and the light bulbs flash.	Safety sensors are misaligned or were momentarily obstructed. Realign both sensors to ensure both LEDs are steady and not flickering. Make sure nothing is hanging or mounted on the door that would interrupt the sensor’s path while closing.
		Door moves 6-8‘ stops or reverses.	Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Check wiring connections at travel module and at the logic board. Replace travel module if necessary.
1	5	No movement, only a single click.	Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Replace logic board if necessary.
		Opener hums for 1-2 seconds no movement.	Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Replace motor if necessary.
1	6	Door coasts after it has come to a complete stop.	Program travel to coasting position or have door balanced by a trained door systems technician.
2	1,2,3,4,5	No movement, or sound.	Replace logic board.
3	2	Unable to set the travel or retain position.	Check travel module for proper assembly, replace if necessary.

Access Master M885 Garage Door Opener Troubleshooting

Problem	Solution
My garage door opener beeps:	• Garage door opener has been activated through a device or feature such as Timer-to-Close, garage door monitor or LiftMaster Internet Gateway,
My remote control will not activate the garage door	• Verify the lock feature is not activated on the door control.
	• Reprogram the remote control.
	• If the remote control will still not activate the door check the diagnostic codes to ensure the garage door opener is working properly
My door will not close and the light bulbs blink on my motor unit	The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction.
	• Verify the safety sensors are properly installed, aligned and free of any obstructions
My garage door opener light(s) will not turn off when the door is open	The garage door opener is equipped with a feature that turns the light on when the safety reversing sensors have been obstructed. This feature can be disabled using the door control
My neighbor's remote control opens my garage door	Erase the memory from your garage door opener and reprogram the remote control(s).
My vehicle's Homelinlc is not programming to my garage door opener	Depending on the make, model, and year of your vehicle an external adapter may be required

Access Master Security+ M200 Garage Door Opener Troubleshooting

Problem	Solution
One or both of the indicator lights on the safety reversing sensors do not glow steady	• Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires reversed), broken or disconnected wires, replace/attach as needed.
	• Disconnect all wires from back of motor unit.
	• Remove sensors from brackets and shorten sensor wires to 1-2 ft. (30-60 cm) from back each of sensor.
	• Reattach sending eye to motor unit using shortened wires. If sending eye indicator light glows steadily, attach the receiving eye.
	• Align sensors, if the indicator lights glow replace the wires for the sensors. If the sensor indicator lights do not light, replace the safety sensors
LED is not lit on door control	• Inspect door control/wires for a short (staple in wire), replace as needed.
	• Disconnect wires at door control, touch wires together. If motor unit activates, replace door control.
	• If motor unit does not activate, disconnect door control wires from motor unit. Momentarily short across red and white terminals with jumper wire. If motor unit activates, replace door control wires
Sending indicator light glows steadily, receiving indicator light is dim or flashing	• Realign receiving eye sensor, clean lens and secure brackets.
	• Verify door track is firmly secured to wall and does not move
Motor has over heated; the motor unit does not operate or trolley is stuck on stop bolt = Motor unit hums briefly; RPM Sensor = Short travel 6-8" (15-20 cm)	• Unplug unit to reset. Try to operate motor unit, check diagnostic code.
	• If it is still flashing 5 times and motor unit moves 6-8’ (15-20 cm), replace RPM sensor.
	• If motor unit doesn’t operate, motor unit is overheated. Wait 30 minutes and retry. If motor unit still will not operate replace logic board
Motor unit doesn’t operate	• Replace logic board because motor rarely fails

Access Master M8856 Garage Door Opener Troubleshooting

Problem	Solution
My door will not close and the light bulbs blink on my motor unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the down direction	• Verify the safety reversing sensors are properly installed, aligned and free of any obstructions.
	• Check diagnostic LED for flashes on the motor unit then refer to the Diagnostic Chart on the following page
My remotes will not activate the door	• Reprogram remotes following the programming instructions.
	• If remote will still not activate your door, check diagnostic LED for flashes on motor unit
My door reverses for no apparent reason: Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel	• Manually check door for balance or any binding problems.
	• Adjust the Force
My door reverses for no apparent reason after fully closing and touching the floor: Repeat safety reverse test after adjustments to force or travel limits. The need for occasional adjustment for the force and limit settings is normal. Weather conditions in particular can affect door travel	Adjust the UP and DOWN Travel Limits. Decrease down travel by turning down limit adjustment screw clockwise
My lights will not turn off when door is open	• The garage door opener is equipped with a security light feature. This feature activates the light on when the safety reversing sensor beam has been obstructed
My motor unit hums briefly	First verify that the trolley is against the stop bolt.
	Release the door from the opener by pulling the Emergency Release Rope.
	Manually bring the door to a closed position.
	Loosen the chain by adjusting the outer nut A to 5 turns. This relieves the tension.
	Run the motor unit from the remote control or door control. The trolley should travel towards the door and stop. If the trolley reengages with the door, pull the Emergency Release Rope to disengage.
	Decrease the UP travel by turning the UP Travel adjustment screw 2 full turns away from the arrow.
	Re-tighten the outer nut so the chain is a 1/2' (13 mm) above the base of the rail. (When the door is reconnected and closed, the chain will sag. This is normal.)
	If the trolley does not move away from the bolt, repeat the steps above

Champion Garage Door Opener Troubleshooting

Situation	Probable Cause & Solution
The door opens but won't close:	1. If the opener lights blink, check the safety reversing sensor.
	2. If the opener lights do not blink and it is a new installation, check the down force.
	Repeat the safety reverse test after the adjustment is complete.
The door reverses for no apparent reason and opener light(s) don't blink:	1. Is something obstructing the door? Pull the manual release handle. Operate the door manually. If it is unbalanced or binding, call for professional garage door service.
	2. Clear any ice or snow from the garage floor area where the door closes.
	3. Review the force adjustment procedures
	Repeat the safety reverse test after the adjustment is complete.
	4. If door reverses in the fully closed position, decrease the travel limits Repeat safety reverse test after the adjustment is complete. The need for occasional adjustment of the force and limit settings is normal. Weather conditions in particular can affect door travel.
The door reverses for no apparent reason and opener light(s) blink for 5 seconds after reversing:	Check the safety reversing sensor. Remove any obstruction or align the receiving eye.
The opener lights don't turn on:	Replace the light bulbs (75 watts maximum). Use a standard neck garage door opener bulb if regular bulb burns out.
The opener lights turn off:	Is the Light Feature on? Turn it off.
The opener strains or maximum force is needed to operate door:	The door may be out of balance or the springs are broken. Close the door and use the manual release handle to disconnect the trolley. Open and close the door manually. A properly balanced door will stay in any point of travel while being supported entirely by its springs. If it does not, disconnect the opener and call for professional garage door service. Do not increase the force to operate the opener.
The opener motor hums briefly, then won't work:	1. The garage door springs are broken.
	2. If the problem occurs on the first operation of the opener, door may be locked. Disable the door lock. If the chain was removed and re-installed, the motor may be out of phase. Remove the chain; cycle the motor to the down position. Observe the drive sprocket. When it turns in a clockwise direction and stops in the down position, reinstall the chain. Repeat the safety reverse test after the adjustment is complete.
The opener won't operate due to power failure:	1. Use the manual release rope and handle to disconnect the trolley. The door can be opened and closed manually. When power is restored, press the Door Control push bar and trolley will automatically reconnect (unless trolley is in lockout position.)
	2. The Outside Quick Release accessory (for use on garages with no service door) disconnects the trolley from outside the garage in case of power failure.
The chain droops or sags:	It is normal for the chain to droop slightly in the closed door position. Use the manual release rope and handle to disconnect the trolley. If the chain returns to the normal height when the trolley is disengaged and the door reverses on a one-inch board (or a 2x4 laid flat), no adjustments are needed.

Garage Door Opener Troubleshooting and Repair