Chamberlain is one of the leading brands that manufactures garage door products for residential and commercial use. If your Chamberlain garage door opener is not working, analyzing Chamberlain error codes can help you troubleshoot and discover the root of the problem. When attempting to resolve any Chamberlain garage door problems, always remember that garage doors are heavy equipment and caution should be used particularly when your garage door is malfunctioning. Below is a list of Chamberlain garage door problems, the error codes they produce and how to solve the issue. ProblemCauseSolutionGarage door opener not responding to commandsNo power supplyWrong wiring on control stationInspect the wiring using the OPEN, CLOSE and STOP LEDs to verify that the wiring is correct. Then ensure that the board is responding to commands. The green LED beside the stop button needs to be on.Interlock switch is activatedExamine interlock(s). If there are multiple external interlocks, they need to be v/ired in series. The green LED beside the stop button needs to be on.Dial not programmedAdjust the dial and set it to the appropriate wiring type.Malfunctioning motorMake sure the motor is receiving the correct voltage.Motor thermal overload trippedFeel the motor to see how hot it is. If it is hot, give it time to cool before trying to move the door. Rotate operator for one full cycle, then reset it by opening and closing it.Accessory malfunctioningDisconnect all devices and reconnect them one at a time to determine which one is causing the failure.Faulty off board relay that needs to be replacedRelay A or B LED should turn on when you press the OPEN, or CLOSE button. The door should respond by moving in the appropriate direction. If the Relay A or B LED does not come on and the door does not respond, the off board may be in need of replacement.Logic board failureLogic board should be replaced.Power led not onSecondary wiring could be loose or a malfunctioning control transformer.You will need to repair/replace faulty connections or the control transformer.Hoist interlock switchInspect interlock to ensure that the manual release chain is not on.Stop button LED not onControl station not connected.Check wiring to ensure the control station or v/ired is connected properly.Interlock switchExamine interlock switch(es) to ensure continuity.Chamberlain garage door will not close all the way. Door will move partially (about 1 foot) then stop and only respond to constant pressure commands.RPM sensor is not connected properly or may need to be replacedCheck the RPM assembly to see if there are any loose connections. Also ensure that the RPM wheel is turning when the operator is on. Inspect optical lens for any debris.Clutch slippingAdjust the clutch and confirm that the door isn’t binding. The RPM may need to be replaced.Door will move most of the way towards a limit then stop. A second open or close command will close the door completely.Error in the Maximum Run Timer setting.Reprogram the Maximum Run Timer manually or reset it to default setting.The door will open but not completely. A second open command will open the door completely.Possible Mid Stop set.Check if the Mid Stop LED lit. Reset the Mid Stop by adjusting the selector dial and setting it on program. Press and hold the Mid Stop button for 5 seconds. Set the dial to the desired wiring type.To reset Open Mid Stop refer.The door will open without delay but when closing, there will be a five second delay after constant pressure is applied on the close buttonSomething may be obstructing the photoelectric sensors, edge or other sensing device.Check to see if the on board LMEP LED is flashing. This means that the photoelectric sensors are misaligned or not connected. Make sure there are no obstructions. Also check safety device wires for continuity and shorts.The logic board suspects the direct connect photoelectric sensors are attached and blockedReset to factory defaults. Chamberlain Hd920 EV Garage Door Opener Troubleshooting The HD920EV garage door opener is a belt drive model equipped with a battery backup feature, allowing the door opener to be functional during a power outage. DIAGNOSTIC CODESYMPTOMSOLUTIONUp Arrow Rash(es)Down Arrow Flash(es)11Garage door opener not closing and LEDs are flashingSafety sensors are not installed/connected. Also could be due to cut wires. Check sensor wires and reconnect or replace as necessary.12The garage door opener is not closing and the LEDs are flashing.Check safety sensors for a short or reversed wire. Replace as necessary.13The door control is not working.Check the wires for the door control to see if they are shorted or if the door control is faulty.14The garage door opener is not closing and the LEDs are flashing.Safety sensors are either misaligned or briefly obstructed. Realign both sensors and ensure both LEDs are not flickering. Also make sure nothing is obstructing the sensor’s path.15Door moves 6-8 inches then stops or reverses.Open the door manually and close it, checking for anything that may be binding or obstructing the doorway. Also inspect wiring connections at the travel module and on the logic board.A single click but no movement.Open the door manually and close it, checking for anything that may be binding or obstructing the doorway. Also inspect wiring connections at the travel module and on the logic board.Humming sound can be heard for 1 -2 seconds but no movement.Open the door manually and close it, checking for anything that may be binding or obstructing the doorway. Also inspect wiring connections at the travel module and on the logic board.16After coming to a stop, the door coasts.Set travel to the coasting position or hire a qualified technician to balance the door.21-5No movement or sound.Replace the logic board.32Travel or retain position cannot be set.Make sure the travel module has been properly assembled. Replace as needed.33Flashing green battery status LEDIndicates an error with the battery backup charging circuit. Replace the logic board.41-4Door moves but stops or reverses.Open the door manually and close it, checking for anything that may be binding or obstructing the doorway like a broken spring. You will need to reprogram the travel if the door is not binding or sticking. If it is, enlist the services of a qualified technician.45Door opens approximately 6-8 inches then stops and reverses.Communication error. Inspect the travel module connections. If nothing seems amiss, replace the travel module.46Garage door will not close and light bulbs are flashing.Misaligned or obstructed safety sensors. Realign both sensors so both LEDs are steady and not flickering. Also ensure that nothing is hanging over the door that can interrupt the sensors’ path. Chamberlain LA400 Garage Door Opener Troubleshooting Chamberlain LA400 and LA400-S are designed for vehicular swing gates and can be used in Class I-III applications. They come with a distinct assemble bracket that affords these models increased mounting flexibility. FAULTPOSSIBLE CAUSEFIXOperator is not working andno LED lights are on.1) No power to board.Battery must be >23V, AC.2) Faulty control board.Replace control board.Operator is not running and does not respond to any commands.1) Low/disconnected battery.Voltage must be >23V.2) Remote not programmed.Program remote.3) STOP connection loose/disconnected.Inspect STOP connections to ensure they are connected properly.4) Operator remaining in Open Command.Remove all Open/Safety devices from obstruction.5) Limits are incorrectly programmed.Set limits accordingly.6) Faulty control board.Replace control board.Motor fails to operate.Motor clicks in response to radio or SBC signal but the operator will not move.1) Low Battery.Voltage must be >23V.2) Disconnected or loose cable wiring between the control box and operator arm.Check for disconnected/loose wiring on the control board to arm. Reconnect wiring or replace if necessary.3) Batteries not connected.Connect batteries.4) Faulty motor.Replace motor.5) Faulty control board.Replace control board.Gate stops and reverses1) Gate ran into an obstruction.Remove obstruction from the gate.2) Force set too low.3) Faulty gate hardware.Have gate hardware repaired or replaced.4) Incorrect arm installation.Reintall arm.RPM reversal1) Obstructed arm (bottom out).Check for any object that may be obstructing the arm. Also make sure that arm is not bottomed out.2) Bad RPM Sensor.Replace arm.3) Too much mA pulled off board.Rearrange accessories to isolate power source.Gate begins to run, then stops completely.1) Low battery.Check to make sure voltage is >23V.2) Gate met an obstruction.Remove obstruction from the gate.Gate opens but fails to close.1) Gate remaining in Open Command.Remove all Open/Safety devices.2) Timer to Close not set.Set Timer to Close.3) Accessory device connected to Open Only command.Rewire desired accessory device to Single Button Input.Three consecutive beeps are heard when command is given.1) Battery Low >23.5VBattery needs to recharge and normal operation will continue once battery voltage reaches 24V.Gates do not open/close in sync1) Bi-Part Delay not set.Seе Bi-Part Delay.2) Limits not programmed correctly.Set the limit.3) Incorrect arm InstallationReinstall arm.Gate will not close automatically.1) Timer to Close not set.Set Timer to Close.2) Obstruction.Check DIAG code and clear obstruction.3) Operator in “Party Mode”.Use remote/SBC for command.4) Constant Open Command.Remove all Open/Safety devices.Accessory device malfunctioning1) Improperly installed.Ensure the accessory is proper installed.2) Enabling Switch not on.Turn on applicable switches.3) Loose or disconnected wires.Check wires to ensure they are connected properly.4) Faulty accessory deviceReplace accessory device. Always be sure to have a qualified technician install your garage door. When done right, you can expect your Chamberlain garage door opener to function well for years to come. Fix It Right Garage Doors can help you troubleshoot and fix your Chamberlain garage door problems. For more information, contact us and a friendly member of our team will be happy to assist you.