Check the sensor alignment by ensuring both sensors face each other directly
Clean the sensor lenses with a dry, lint-free cloth
Remove any obstructions between the sensors (boxes, tools, spider webs, dirt buildup)
Verify the sensors are mounted securely and not loose or shifted
Adjust the sensor brackets so the indicator lights on both sensors match (usually both solid)
Inspect sensor wires for damage, cuts, fraying, or loose connections
Re-seat wire connections at the sensor terminals and at the opener control board
If wiring is damaged, replace the affected section or the full sensor wire run
Confirm power to the opener and that the control board is receiving power
Check the safety sensor indicator on the opener (if present) for correct status
Reset the opener by unplugging it for 30 seconds, then plugging it back in
If using a multi-button wall control, ensure it’s functioning and not stuck
Test the door by closing it and verifying the sensors stop/reverse behavior correctly
Replace the safety sensors if alignment and wiring checks do not restore proper operation