How to Fix a Craftsman Garage Door Remote That Won't Work

As with any remote controller, problems with Craftsman garage door remotes are usually due to an exhausted battery.

Four flashes indicate safety sensors are misaligned.Four flashes indicate safety sensors are misaligned.
The door opener motors have programmed self-diagnostic functionality though which will help you isolate whether the problem is with the door or the remote. The "Learn" button on the motor has a diagnostic LED (light emitting diode) adjacent to it that flashes in a sequence, then pauses, and then flashes the sequence again.

Replace the battery in the remote control if the remote control doesn't work.

Check for obstructions at the door if the remote control is erratic. For example, the door will not close or reverses suddenly and the lights blink on the motor unit.

Reprogram the remote control. Press the learn button on the motor and release it. Within 30 seconds, press and hold the button on the remote that you are having a problem with. Release the button when the motor unit light blinks.

Test the remote control.

Things You Will Need

  • Replacement battery

Tip

  • Perform the self-diagnostic tests on the motor. Press the Learn button on motor. Any flashing indicates a problem with the door, not the remote. One flash indicates a broken or disconnected safety wire at the door; Two flashes indicate a short at the door; Three flashes indicate a door control short; four flashes indicate safety sensors are misaligned; five flashes indicate sensor failure---unplug the motor and plug it back in. Six flashes indicate the circuit board at the motor has failed.

About the Author

Patrick Nelson has been a professional writer since 1992. He was editor and publisher of the music industry trade publication "Producer Report" and has written for a number of technology blogs. Nelson studied design at Hornsey Art School.