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32
Diagnostic Chart
Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWNarrowson the garage door opener flash the diagnosticcodes.NOTE: For troubleshooting questions, please visit
LiftMaster.com.
DIAGNOSTIC CODE SYMPTOM SOLUTION
Up Arrow
Flash(es)
Down Arrow
Flash(es)
1 1 The garage door opener will not close and the light
bulbs flash.
Safety sensors are notinstalled,connected, or wires may be cut. Inspectsensor 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.Inspectsafety sensor wire atall staple and
connection points, replace wire or correctas needed.
1 3 The door control will not function. The wires for the door control are shorted or the door control is faulty. Inspectdoor control wires atall
staple and connection points, replace wire or correctas 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 ishanging or mounted on the door that would
interruptthe sensor’spath while closing.
1 5 Door moves 6-8" (15-20 cm) stops or reverses. Manuallyopen and close the door. Check for binding or obstructions,such as a broken spring or
door lock, correct as needed. Checkwiring connections attravel module and at the logic board.
Replace travel module if necessary.
No movement, only a single click. Manually open and close the door. Checkfor 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.
Manuallyopen 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 coastsafter it has come to a complete stop. Program travel to coasting position or have door balanced bya trained door systems technician.
2 1-5 No movement, or sound. Replace logicboard.
3 2 Unable to setthe travel or retain position. Check travel module for proper assembly,replace ifnecessary.
4 1-4 Door is moving stops or reverses. Manuallyopen and close the door. Check for binding or obstructions,such as a broken spring or
door lock, correct as needed. Ifthe door is binding or sticking contacta trained door systems
technician. Ifdoor is not binding or sticking attempt to reprogram travel (refer to page 25).
4 5 Opener runs approximately 6-8" (15-20 cm),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 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 ishanging or mounted on the door that would
interruptthe sensor’spath while closing.
Troubleshooting
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