Diagnostic Chart - Craftsman 139.53939D Owner's Manual

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Safety Reversing Sensor
Diagnostic Chart
Bell Wire
Safety reversingsensorswire
open (brokenor disconnected).
o_ cz J_
1 ZZZZZZZZ,£ZZ,£ZZZZZZZL_ZZZZZZZZ_'_ZZ_ZZZ ZZZZZZZZZZZZZZZZZZZ
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.
OR
Safety reversingsensorswire
shortedor black/whitewire
reversed.
Door controlor wire shorted.
Safety reversingsensors
slightlymisaligned
(dim or flashingLED).
Motor RPM is not recognized.
•"0 Symptom:Oneor bothof the Indicatorfights on the safety reversingsensorsdo not glow
steady.
• 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 eyeto motor unit using shortened wires. If sending eye indicator light glows
steadily, attach the receiving eye.
• Align sensors, if the indicator lights glow replacethe wires for the sensors. If the sensor
indicator lights do not light, replace the safety reversing sensors.
•.0 Symptom:The door doesn'tactivate from the 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, replacedoor
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:Sendingindicator fight glows steadily, receivingindicator fight is dim or flashing.
• Realign receiving eye sensor, clean lens and secure brackets.
•0
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, motorruns2-3 seconds.
• Reconnect the emergency release.
• Motor may need to be replaced.
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