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Diagnostic chart, Operation – Chamberlain 248730 User Manual

Page 36

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35

Operation

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.

Installed
Safety Reversing
Sensor

“Learn”
Button

Safety Reversing
Sensor

Bell Wire

Diagnostics Located
on Motor Unit

LED or
Diagnostic
LED

1 Flash

Safety reversing
sensors wire open
(broken or
disconnected).
OR

2 Flashes

Safety reversing
sensors wire shorted
or black/white wire
reversed.

Symptom: One or both of the Indicator lights on the safety
reversing sensors do not glow steady.

l

Inspect sensor wires for a short (staple in wire), correct
wiring polarity (black/ white wires reversed), broken or
disconnected wires, replace/attach as needed.

l

Disconnect all wires from back of motor unit.

l

Remove sensors from brackets and shorten sensor wires
to 1-2 ft. (30-60 cm) from back each of sensor.

l

Reattach sending eye to motor unit using shortened wires.
If sending eye indicator light glows steadily, attach the
receiving eye.

l

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.

3 Flashes

Door control or wire
shorted.

Symptom: LED is not lit on door control.

l

Inspect door control/wires for a short (staple in wire),

replace as needed.

l

Disconnect wires at door control, touch wires together. If
motor unit activates,
replace door control.

l

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.

4 Flashes

Safety reversing
sensors slightly
misaligned (dim or
flashing LED).

Symptom: Sending indicator light glows steadily, receiving
indicator light is dim or flashing.

l

Realign receiving eye sensor, clean lens and secure
brackets.

l

Verify door track is firmly secured to wall and does not
move.

5 Flashes

Motor overheated or
possible RPM sensor
failure. Unplug to
reset.

Symptom: Motor has over heated; the motor unit does not
operate or trolley is stuck on stop bolt = Motor unit hums briefly;
RPM Sensor = Short travel 6-8" (15-20 cm).

l

Unplug unit to reset. Try to operate motor unit, check
diagnostic code.

l

If it is still flashing 5 times and motor unit moves 6-8" (15-20
cm), replace RPM sensor.

l

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.

6 Flashes

Motor Circuit Failure.
Replace Receiver
Logic Board.

Symptom: Motor unit doesn’t operate.

l

Replace logic board because motor rarely fails.

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