Troubleshooting - Craftsman 139.54985 Owner's Manual

TROUBLESHOOTING
DIAGNOSTIC CHART
Your garage door opener is programmed with self-diagnostic capabilities. The UPand 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.
The garage door opener will not
close and the light bulbs flash.
Safetysensors are not installed, connected, or wires may be
cut. Inspect sensor wires for a disconnected or cut wire.
There is a short or reversedwire for the safety sensors. Inspect
safety sensor wire at all staple and connection points, replace
wire 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, replacewire or correct as needed.
The garage door opener will not
close and the light bulbs flash.
Safetysensors are misaligned or were momentarily obstructed.
Realign both sensors to ensure both LEDsare 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.
No movement, only a single
click.
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.Check wiring connections at travel module and at the
logic board. Replacetravel module if necessary.
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.
1 6 Door coasts after it has come to a Programtravel to coasting position or have door balanced by a
complete stop. trained door systems technician.
2 1-5 No movement, or sound. Replacelogic board.
3 2 Unable to set the travel or retain Checktravel module for proper assembly, replace if necessary.
position.
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