Diagnostic Chart - Chamberlain ML800EV Assembly And Operating Instructions Manual

Diagnostic Chart

Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the garage opener flash the diagnostic codes.
DIAGNOSTIC CODE
Up Arrow Down Arrow
Flash(es) Flash(es)
1 1 The garage door opener will not
close and the light bulbs flash
1 2 The garage door opener will not
close and the light bulbs flash.
1 3 The door control will not function.
1 4 The garage door opener will not
close and the light
1 5 Door moves 6-8" stops or reverses.
No movement, only a single click.
Opener hums for 1-2 seconds no
movement.
1 6 Door coast after it has come to a
complete stop.
2 1-5 No movement or sound.
4 1-4 Door is moving stops and or
reverses.
5 1 Terminal 1+2 for wall control is short-
ened longer than 4 seconds
SYMPTOM
Safety sensors are not installed, connected or wires may be cut. Inspect sensor wires-
for a disconnected or cut wire.
There is a short or reversed wire for the safety sensors. Inspect safety sensor wire at
all staple points and connection points and replace wire or correct as needed.
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 correct as
needed.
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 sensors path while closing.
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.
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.
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.
Program travel to coasting position or have door balanced by a trained technician.
Replace logic board.
Manually open and close 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 technician. If door is not binding or sticking attempt to reprogram
travel (refer to page 24 ).
Check wiring for push button if button is stuck and activated permanently. Remove
wiring from terminal 1+2 on operator as test. Do not run push button wires next to high
voltage wiring or in same conduit.
SOLUTION
en 11/13