LiftMaster 8165 Contractor Series User's Guide Manual - Page 13

Troubleshooting, Diagnostic Chart - logic board

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Troubleshooting Diagnostic Chart Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the garage door opener will flash the diagnostic codes. DIAGNOSTIC CODE Up arrow Flash(es) Down arrow Flash(es) 1 1 1 2 1 3 1 4 1 5 1 6 2 1-5 3 2 SYMPTOM SOLUTION The garage door opener will not close and the light bulbs flash. The garage door opener will not close and the light bulbs flash. The door control will not function. The garage door opener will not close and the light bulbs flash. Door moves 6-8" stops or reverses. No movement, only a single click. Opener hums for 1-2 seconds no movement. Door coasts after it has come to a complete stop. No movement, or sound. Safety sensors are not installed, connected, or wires may be cut. Inspect sensor wires for a disconnected or cut wire. There is a short or reversed wire for the safety sensors. Inspect safety sensor wire at all staple and connection points, replace wire or correct as needed. The wires for the door control are shorted or the door control is faulty. Inspect door control wires at all staple and connection points, replace wire or correct as needed. Safety sensors are misaligned or were momentarily obstructed. Realign both sensors to ensure both LEDs are steady and not flickering. Make sure nothing is hanging or mounted on the door that would interrupt the sensor's path while closing. Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Check wiring connections at travel module and at the logic board. Replace travel module if necessary. Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Replace logic board if necessary. Manually open and close the door. Check for binding or obstructions, such as a broken spring or door lock, correct as needed. Replace motor if necessary. Program travel to coasting position or have door balanced by a trained door systems technician. Replace logic board. Unable to set the travel or retain position. Check travel module for proper assembly, replace if necessary. 13

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13
DIAGNOSTIC CODE
SYMPTOM
SOLUTION
Up arrow
Flash(es)
Down arrow
Flash(es)
1
1
The garage door opener will not close and the light
bulbs flash.
Safety sensors are not installed, connected, or wires may be cut. Inspect sensor wires for a
disconnected or cut wire.
1
2
The garage door opener will not close and the light
bulbs flash.
There is a short or reversed wire for the safety sensors. Inspect safety sensor wire at all
staple and connection points, replace wire or correct as needed.
1
3
The door control will not function.
The wires for the door control are shorted or the door control is faulty. Inspect door control
wires at all staple and connection points, replace wire or correct as needed.
1
4
The garage door opener will not close and the light
bulbs flash.
Safety sensors are misaligned or were momentarily obstructed. Realign both sensors to
ensure both LEDs are steady and not flickering. Make sure nothing is hanging or mounted on
the door that would interrupt the sensor’s path while closing.
1
5
Door moves 6-8" stops or reverses.
Manually open and close the door. Check for binding or obstructions, such as a broken
spring or door lock, correct as needed. Check wiring connections at travel module and at the
logic board. Replace travel module if necessary.
No movement, only a single click.
Manually open and close the door. Check for binding or obstructions, such as a broken
spring or door lock, correct as needed. Replace logic board if necessary.
Opener hums for 1-2 seconds no movement.
Manually open and close the door. Check for binding or obstructions, such as a broken
spring or door lock, correct as needed. Replace motor if necessary.
1
6
Door coasts after it has come to a complete stop.
Program travel to coasting position or have door balanced by a trained door systems
technician.
2
1-5
No movement, or sound.
Replace logic board.
3
2
Unable to set the travel or retain position.
Check travel module for proper assembly, replace if necessary.
Troubleshooting
Diagnostic Chart
Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the garage door opener will flash the diagnostic codes.