Diagnostic Chart - Craftsman 139.53920D Owner's Manual

Bell W_e
Your garage door opener is programmed with
self-diagnostic capabilities. The "Learn" button!diagnostic
LED will flash a number of times then pause signifying it
has found a potential issue. Consult Diagnostic Chart below.
Diagnostic Chart
Safety reversing sensors
wire open (broken or
disconnected).
OR
Safety reversing sensors
wire shorted or
black/white wire
reversed,
®
Door control or
wire shorted.
0
Safety reversing sensors
slightly misaligned
(dim or flashing LED).
Motor overheated or
possible RPM sensor
failure. Unplug to reset.
Motor Circuit Failure,
Replace Receiver
Logic Board.
Symptom: One or both of the Indicator lights on the safety sensors do
not glow steady.
- Inspect sensor wires for a short (staple in wire), correct wiring polarity
(blackJwhite wires reversed), broken or disconnected wires, replace/attach
as needed.
• Disconnect all wires from back of motor unit
- Remove sensors from brackets and shoden sensor wires to 1-2 ft
(30-60 cm) from back each of sensor
- Reattach sending eye to motor unit using shortened wires If sending eye
indicator light glows steadily, attach the receiving eye.
• Align sensors, if the indicator lights glow replace the wires for the sensors.
If the sensor indicator lights do not light, replace the safety sensors.
Symptom: LED is not lit on door control.
- inspect door control/wires for a short (staple in wire), replace as needed.
. Disconnect wires at door control, touch wires together If motor unit
activates, replace door control
= If motor unit does not activate, disconnect door control wires from motor
unit Momentarily short across red and white terminals with jumper wire.
If motor unit activates, replace door control wires.
Symptom: Sending indicator light glows steadily, receiving indicator
light is dim or flashing.
• Realign receiving eye sensor, clean lens and secure brackets
• Verify door track is firmIy secured to wall and does not move.
Symptom: Motor has overheated; the motor unit does not operate or
trolley is stuck on stop bolt = Motor unit hums briefly; RPM Sensor =
Short travel 6_8" (15_20 cm),
- Unplug unit to reset Try to operate motor unit, check diagnostic code.
- If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace
RPM sensor.
. If motor unit does not operate, motor unit is overheated.. Wait 30 minutes
and retry.. If motor unit still wil! not operate repIace logic board
Symptom: Motor unit does not operate.
. Replace logic board because motor rarely fails.
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