Diagnostic Chart - Chamberlain POWER DRIVE PD300 Manual

Operation

Diagnostic Chart

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