Chamberlain 8355 - Troubleshooting; Diagnostic Chart

33
Diagnostic Chart
Your garage door opener isprogrammed with self-diagnosticcapabilities. The UP and DOWN arrows on the garage door opener flash the diagnosticcodes.
DIAGNOSTICCODE 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 sensorsare notinstalled, connected or wires maybe 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 isa short or reversed wire for the safetysensors.Inspect safetysensor wire at all staple points
and connection points and 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 safety sensor wire at all
staple points and connection points and replace wire or correctasneeded.
1 4 The garage door opener will not close and the light
bulbs flash.
Safety sensorsare misaligned or were momentarily obstructed. Realign both sensors to ensure both
LEDs are steady and notflickering.Make sure nothing is hanging or mounted on the door that would
interruptthe sensors path while closing.
1 5 Door moves6-8" stops or reverses. Manuallyopen and close the door. Checkfor binding or obstructions,such as a broken spring or door
lock, correctas needed. Checkwiring connections attravel module and at the logicboard. 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, correctas needed. Replace logic board if necessary.
Opener hums for 1-2 seconds no movement. Manuallyopen and close the door. Checkfor binding or obstructions,such as a broken spring or door
lock, correctas needed. Replace motor if necessary.
1 6 Door coast after it has come to a complete stop. Program travel to coasting position or have door balanced by a trained 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 if necessary.
Troubleshooting