Diagnosticchart - Craftsman 139.53918D Owner's Manual

DiagnosticChart
I L
Yourgarage door opener is programmed with serf-diagnostic
capabilities. The "Learn" button/diagnostic LED wi// f/ash a
number of times then pause signifyingit has found a potential
issue. ConsultDiagnostic Chartbelow.
Safety reversingsensors
wire open (brokenor
disconnected).
OR
Safety reversingsensorswire
shortedor black/whitewire
reversed.
Door controlor wire shorted.
Safety reversingsensors
slightly misaligned
(dim or flashingLED).
Motor RPM is not recognized.
• Symptom:Oneor bothof the Indicatorfights on the safety reversingsensorsdo not
glowsteady.
• Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires
reversed), broken or disconnected wires, replace/attachas needed
• Disconnect all wires from back of motor unit
• Remove sensors from brackets and shorten 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, replacethe safety reversing sensors.
•.0 Symptom:LEDis 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, replacedoor
control wires.
•.• Symptom:Sendingindicator fight glows steadily, receivingindicator fight is dim or
flashing.
• Realign receiving eye sensor, clean lens and secure brackets.
• Verify door track is firmly secured to wall and does not move.
•.• Symptom:Door travels 2-3 inches and stops.
• Reprogram limits and forces. See Adjustment section.
• If the motor unit continues to travel 2-3 inches, check the travel module connection or
replace the travel module.
Symptom: No movement, motor runs2-3 seconds.
• Reconnect the emergency release.
• Motor may need to be replaced.
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