LiftMaster 8165W Owners Manual - Page 43

Troubleshooting Diagnostic Chart Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the garage door opener flash the diagnostic codes. DIAGNOSTIC CODE SYMPTOM SOLUTION Up Arrow Flash(es) Down Arrow Flash(es) 1 1 The garage door opener will not close and the Safety reversing sensors are not installed, connected, or wires may be cut. Inspect sensor light bulbs flash. wires for a disconnected or cut wire. 1 2 The garage door opener will not close and the There is a short or reversed wire for the safety reversing sensors. Inspect safety sensor light bulbs flash. 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 Safety reversing sensors are misaligned or were momentarily obstructed. Realign both light bulbs flash. 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" (15-20 cm) stops or Manually open and close the door. Check for binding or obstructions, such as a broken reverses. 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 Program travel to coasting position or have door balanced by a trained door systems stop. 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. 3 3 The battery status LED is constantly flashing Battery backup charging circuit error, replace the logic board. *(if applicable) green. * 43