Troubleshooting - Craftsman 139.30437 Owner's Manual

TROUBLESHOOTING
DIAGNOSTIC CHART
Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWNarrows on the garage door opener flash
the diagnostic codes.
UP ARROW DOWNARROW
SYMPTOM SOLUTION
FLASH(ES) FLASH(ES)
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.
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,
replacewire or correct as needed.
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.
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. Checkfor binding or
obstructions, such as a broken spring or door lock, correct as
needed. Checkwiring connections at travel module and at
logic board. Replacetravel 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.
Manually open and close the door. Checkfor binding or
obstructions, such as a broken spring or door lock, correct as
needed. Replace motor if necessary.
Door coasts after it has come Program travel to coasting position or have door balanced by
1 6
to a complete stop. a trained door systems technician.
2 1-5 No movement, or sound. Replacelogic board.
Unableto set travel or retain Check travel module for proper assembly, replace if
3 2
position, necessary.
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