Craftsman 139.53901DM1/2 HP Manual Del Propietário página 34

Bell Wire
Safety Reversing Sensor
Diagnostic Chart
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.
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 overheatedor possible
RPM sensorfailure. Unplug
to reset.
Motor circuit failure.
Replace receiver logic
board.
•.• Symptom:One or both of the indicator lights 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.
• Removesensors 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 replacethe wires for the sensors. If the sensor
indicator lights do not light, replacethe safety reversing sensors.
•.• Symptom:LED is not lit on doorcontrol.
• Inspect door control/wires for a short (staple in wire), replaceas 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 light glows steadily, receiving indicatorlight ls 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:Motor has overheated;the motorunit does not operateor trolley ls stuckon
stop bolt = Motor unit hums briefly; RPM Sensor= Shorttravel 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 doesn't operate, motor unit is overheated.Wait 30 minutes and retry. If
motor unit still will not operate replacelogic board.
."• Symptom:Motor unit does not operate.
• Replace logic board because motor rarely fails.
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