Diagnostic chart, Control console or wire shorted, Possible rpm sensor failure. unplug to reset – Craftsman 139.53918d User Manual
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Safety Reversing Sensor
Diagnostic Chart
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Your garage door opener is programmed with
seif-diagnostic capabiiities. The “Learn” button/diagnostic
LED win fiash a number of times then pause signifying it
has found a potentiai issue. Consult Diagnostic Chart below.
Safety reversing sensors
wire open (broken
or disconnected).
OR
Safety reversing sensors
wire shorted or
biack/white wire
reversed.
Control console or
wire shorted.
Safety reversing sensors
slightly misaligned
(dim or flashing LED).
Possible RPM sensor
failure. Unplug to reset.
Symptom: One or both of the Indicator lights on the safety reversing sensors
do not glow steady.
• Inspect sensor wires for a short (staple in wire), correct wiring polarity
(biack/white wires reversed), broken or disconnected wires, replace/attach
as 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 giows 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 reversing sensors.
I
Symptom: LED is not lit on control console.
• Inspect control console/wires for a short (staple in wire), replace as needed.
• Disconnect wires at control console, touch wires together. If mofor unit activates,
replace control console.
• If motor unit does not activate, disconnect control console wires from motor unit.
Momentarily short across red and white terminals with jumper wire. If mofor unit
activates, replace control console wires.
I
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 firmly secured to wall and does not move.
I
Symptom: 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 doesn’t operate, motor unit is overheated. Wait 30 minutes and retry. If
motor unit still will not operate replace logic board.
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