Chamberlain PD432DM 1/2 HP Diagnostic Chart, 1 FLASH, 2 FLASHES, 3 FLASHES, 4 FLASHES, 5 FLASHES, 6 FLASHES

Diagnostics

Located On

Motor Unit

LED or

Diagnostic

LED “Learn”

Button

Safety Reversing Sensor

Installed

Safety Reversing

Sensor

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.

Diagnostic Chart

	1 FLASH	Symptom: One or both of the indicator lights on the safety reversing sensors
		do not glow steady.
Safety reversing sensors
		• Inspect sensor wires for a short (staple in wire), correct wiring polarity
wire open (broken or
			(black/white wires reversed), broken or disconnected wires, replace/attach
disconnected).
			as needed.
	OR
		• Disconnect all wires from back of motor unit.
	2 FLASHES	•	Remove sensors from brackets and shorten sensor wires to 1-2 ft. (30-60 cm)
			from back each of sensor.
Safety reversing sensors		•	Reattach sending eye to motor unit using shortened wires. If sending eye
wire shorted or black/white			indicator light glows steadily, attach the receiving eye.
wire reversed.
		• Align sensors, if the indicator lights glow replace the wires for the sensors. If
	3 FLASHES		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.
Door control or wire shorted.
		• 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.
	4 FLASHES	Symptom: Sending indicator light glows steadily, receiving indicator light is
		dim or flashing.
Safety reversing sensors
		• Realign receiving eye sensor, clean lens and secure brackets.
slightly misaligned
(dim or flashing LED).		• Verify door track is firmly secured to wall and does not move.
	5 FLASHES	Symptom: Motor has overheated; the motor unit does not operate;
		RPM Sensor = Short travel 6-8" (15-20 cm).
Motor overheated or possible		• Unplug unit to reset. Try to operate motor unit, check diagnostic code.
RPM sensor failure. Unplug		• If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace
to reset.
			RPM sensor.
		•	If motor unit doesn’t operate, motor unit is overheated. Wait 30 minutes and
	6 FLASHES		retry. If motor unit still will not operate replace logic board.
		Symptom: Motor unit doesn’t operate.
		• Replace logic board because motor rarely fails.
Motor Circuit Failure.
Replace Receiver Logic
Board.			34