Craftsman 139.53910 - Manual (Page 34)

Safety Sensor
Diagnostic Chart
Your garage door opener is programmed with
self-diagnostic capabiiities. The “Learn” buttonidiagnostic
LED will flash a number of times then pause signifying it
has found a potendai issue. Consuit Diagnostic Chart below.
Safety sensors wire open
(broken or disconnected).
OR
•m m
Safety sensors wire
shorted or black/white
wire reversed. .............
Door control or
wire shorted.
Safety Sensors
slightly misaligned
(dim or flashing LED).
SHE^
Motor overheated or
possible RPM sensor
failure. Unplug to reset.
Motor Circuit Failure.
Replace Receiver
Logic Board. .............
Sym ptom : O ne 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), broken or disconnected wires, replace/attach
■) as needed. ■■.■■■ ■' ■■ ■, ■. '■■ ■ ■::::::::: (/.V ''■■■ ■■■, / ....'
• Disconnect ail 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, replace the safety sensors.
Sym ptom : LED is not lit on door controi.
• 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 controi wires. ; : : : ; ^ ^ \
0 Sym ptom : Sending indicator light glow s steadily, receiving indicator light
is dim or flashing. / V ■ ■■ ■■ ■.: ■ ,, ,: :::: ,) , ; ' , : : ,,
•; Realign receiving eye sensor, cieon lens and secure brackets,
• Verify door track is firmiy secured to wall and does not move, (V
Sym ptom : M otor has overheated; the m otor unit does not operate or
trolley is stuck on stop boit = M otor unit hum s briefly; RPM Sensor
=
Short travel 6^8" (15-20 cm ).
• Unplug unit to reset. Try to operate rnptor 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.
Sym ptom : M otor unit doesn’t operate.
• Replace logic board because motor rarely fails.
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