Chamberlain 248739 User Manual download pdf (Page 36)

Diagnostic Chart

Safety reversing sensors

slightly misaligned (dim or

ﬂ ashing LED).

Door control or wire shorted.

Safety reversing sensors

wire shorted or black/white

wire reversed.

Safety reversing sensors wire

open (broken or disconnected).

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), 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 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.

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.

Symptom: Sending indicator light glows steadily, receiving indicator light is

dim or ﬂ ashing.

• Realign receiving eye sensor, clean lens and secure brackets.

• Verify door track is ﬁ rmly secured to wall and does not move.

Symptom: Motor has overheated; the motor unit does not operate or trolley is

stuck on stop bolt = Motor unit hums brieﬂ y; 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 ﬂ ashing 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.

Symptom: Motor unit doesn’t operate.

• Replace logic board because motor rarely fails.

1 FLASH

2 FLASHES

3 FLASHES

4 FLASHES

Your garage door opener is programmed with self-

diagnostic capabilities. The “Learn” button/diagnostic LED

will ﬂ ash a number of times then pause signifying it has

found a potential issue. Consult Diagnostic Chart below.

Motor overheated or possible

RPM sensor failure. Unplug to

reset.

5 FLASHES

Motor Circuit Failure. Replace

Receiver Logic Board.

6 FLASHES

LED or

Diagnostic

LED

“Learn”

Button

Diagnostics

Located On

Motor Unit

Bell Wire

Safety Reversing Sensor

Installed

Safety Reversing

Sensor

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Chamberlain 248739 User Manual Page 36

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