Here are the most common problems, along with the most likely repairs for each.
For adjustments and repairs that aren’t self-evident, check the owner’s manual or contact a professional.
Garage door opener does not operate with either the remote or the wall switch.
The power source has probably been disrupted. Make sure the motor unit is plugged in. Check the circuit breaker, fuse or GFCI.
Garage door won’t close all the way.
The close limit switch needs adjusting. If not, see if the door is binding when raised and lowered manually.
Garage door reverses immediately after hitting floor.
The close limit switch probably needs adjusting.
Garage door reverses before hitting floor.
The close force probably needs adjusting.
Garage door does not open completely.
The limit switch may need to be moved toward motor unit.
The garage door opens, but the motor won’t stop running.
The limit switch probably needs to be moved away from the motor unit.
The garage door won’t open or close with remote control.
There are several possible solutions: (1) Move closer to the door (you might be out of range); (2) Make sure that the antenna on the motor unit is hanging down; (3) If the door functions fine with the wall switch, replace the battery in the remote; (4) Reprogram the remote.