Diagnostic Chart - Craftsman 139.5391 Owner's Manual

Bell Wire
Safe_ 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 sensors wire open
(broken or disconnected).
OR
Safety sensors w=re
shorted or black/white
wire reversed
Door control or
wire shorted.
Safety Sensors
slightly misaligned
(dim or flashing LED).
"-0 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
/black/white wires reversed'L 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 fl (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
-0 Symptom: 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.
_ymptom: 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.
| == Symptom: Motor has overheated; the motor unit does not operate or
.............. T"'w trolley is stuck on stop bolt = Motor unit hums briefly; RPM Sensor =
Motor overheated or
possible RPM sensor
failure. Unplug to reset.
Motor Circuit Failure.
Replace Receiver
Logic Board.
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 wilt not operate replace logic board.
)tom: Motor unit doesn't operate.
• Replace logic board because motor rarely fails.
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