LiftMaster LJ8950W LJ8950W Manual - Page 27

Troubleshooting Diagnostic Chart Your door operator is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the door operator flash the diagnostic codes. UP Button DOWN Button DIAGNOSTIC CODE SYMPTOM Up Arrow Down Arrow Flash(es) Flash(es) SOLUTION 1 1 The door operator will not close. Safety reversing sensors are not installed, connected or wires may be cut. Inspect sensor wires for a disconnected or cut wire. 1 2 1 3 1 4 1 5 1 6 The door operator will not close. The door control will not function. The door operator will not close. Door moves 6-8" (15-20 cm) stops or reverses. No movement, only a single click. Door operator hums for 1-2 seconds no movement. Door coast after it has come to a complete stop. There is a short or reversed wire for the safety reversing sensors. Inspect sensor wire at all staple points and connection points and replace wire or correct as needed. The wires for the door control are shorted or the door control is faulty. Inspect sensor wire at all staple points and connection points and replace wire or correct as needed. Safety reversing 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 sensors 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 technician. 2 1-5 No movement or sound. Replace logic board. 3 1 3 3 The door operator moves slightly, then stops The battery status LED is constantly flashing green. Activate the operator again. If problem persists, replace logic board. Battery backup charging circuit error, replace logic board. 3 5 Garage door opener will Remove the resistor from the green terminal of the operator's logic board not set travel, close, or and cycle power 3 times leaving the unit unplugged for 10 seconds, re-install door reverses during resistor to operator. If the error code is still present, replace the resistor or travel. logic board. 4 1-4 Door is moving stops and Manually open and close the door. Check for binding or obstructions, such or reverses. as a broken spring or door lock, correct as needed. If the door is binding or sticking contact a trained door systems technician. If door is not binding or sticking attempt to reprogram travel (refer to page 20). 4 5 Door operator runs Communication error to travel module. Check travel module connections, approximately 6-8" replace module if necessary. (15-20 cm), stops and reverses. 4 6 The door operator will Safety reversing sensors are misaligned or were momentarily obstructed. not close. 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. 5 5 Door will not close when Replace logic board. using timer-to-close or myQ Smartphone control. 27