Craftsman 139.53920D owner manual Diagnostic Chart, Symptom LED is not lit on door control

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,

®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.

Door control or

wire shorted.

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.

0Symptom: 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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