LiftMaster 8550 8550 Manual - Page 36

Troubleshooting DIAGNOSTIC UP CODE ARROW DOWN ARROW SYMPTOM CAUSE RESOLUTION 3-3 3 FLASHES 3 FLASHES The garage door opener is idle and the battery LED is constantly flashing green Battery LED flashing Replace the logic board. Green, charging circuit stops and starts to drain causing battery charging status. 4-1 4 FLASHES 1 FLASH Door is closing, stops and Obstruction, binding or If your door is binding or sticking, contact a trained door systems technician. If your door is okay, reprogram reverses sticking door the travel, refer to page 24. 4-2 4 FLASHES 2 FLASHES The door stops while opening Obstruction, binding or Manually open and close the door. Check for binding or obstructions. Refer to page 2. for no apparent reason sticking door 4-3 4 FLASHES 3 FLASHES The door reverses for no Obstruction, binding or If your door is binding or sticking, contact a trained door systems technician. If your door is okay, reprogram apparent reason or after sticking door the travel, refer to page 24. touching the floor 4-4 4 FLASHES 4 FLASHES My door reverses for no Obstruction, binding or Manually open and close the door. Check for binding or obstructions. Refer to page 2 . apparent reason or after sticking door touching the floor 4-5 4 FLASHES 5 FLASHES The opener runs Communication error to Disconnect all power, remove cover, and locate the travel module. Ensure the wires for travel module are approximately travel module connected, if wires are connected, then replace the travel module. 6-8" and stops and/or reverses 4-6 4 FLASHES 6 FLASHES The door reverses for no Safety sensors were Review Diagnostic Codes 1-1, 1-2, and 1-4 correct as necessary. If problem persists remove the sensors apparent reason while temporarily obstructed from the brackets and realign the sensors ensuring the LED's are steady and not flickering. Check for a traveling down or misaligned temporary obstruction such as a rope attached to the door. Excessive vibration on the door rails may cause the sensors to be misaligned while the door is closing, secure rails or re-install the sensor brackets to the wall or floor, refer to page 18. These are additional troubleshooting issues that will not show up in the diagnostic codes: My garage door opener beeps every 30 seconds: Refer to the Battery Status LED section on page 27. My remote control wil not activate the garage door: • Verify the lock feature is not activated on the door control. • Reprogram the remote control. • If the remote control will still not activate the door check the diagnostic codes to ensure the garage door opener is working properly. My garage door opener light(s) will not turn off when the door is open: The garage door opener is equipped with a feature that turns the light on when the safety reversing sensors have been obstructed or when the motion sensor on the door control detects movement in the garage. These features can be disabled using the door control, refer to the Door Control section. My neighbor's remote control opens my garage door: Erase the memory from your garage door opener and reprogram the remote control(s). The LEDs on the door conrol blink: If you have an Smart Control Panel installed and the TTC is set to a custom time, press the ON button on the Premium Motion -Detecting Control Panel to set the time properly. 36