Chamberlain 248730 User Manual download pdf (Page 36)

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).

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.

Inspectsensor wires for a short (staple in wire),correct

wiring polarity (black/ white wires reversed), broken or

disconnected wires,replace/attach as needed.

Disconnectall wires from backof motor unit.

Remove sensorsfrom brackets and shorten sensor wires

to 1-2 ft. (30-60 cm) from backeach of sensor.

Reattach sending eye to motor unit using shortened wires.

If sending eye indicator light glowssteadily,attach the

receiving eye.

Align sensors, if the indicator lightsglow replace the wires

for the sensors.If the sensor indicator lightsdo not light,

replace the safety reversing sensors.

3 Flashes

Door control or wire

shorted.

Symptom: LED is not lit on door control.

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

replace as needed.

Disconnectwires at door control, touch wires together. If

motor unit activates,

replace door control.

If motor unit does not activate,disconnectdoor control

wires from motor unit.

Momentarily short acrossred 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.

Realign receiving eye sensor, clean lens and secure

brackets.

Verify door trackis firmlysecured 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).

Unplug unit to reset. Tryto 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.

6 Flashes

Motor Circuit Failure.

Replace Receiver

Logic Board.

Symptom: Motor unit doesn’t operate.

Replace logic board because motor rarely fails.

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Chamberlain 248730 User Manual Page 36

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