
This DIY repair guide explains how to replace a safety sensor on a garage door opener. The garage door opener has two sensors that prevent the garage door from closing on a person or object: one that sends an infrared beam and one that receives the beam. If an object or person is in the way of the beam, the closing door reverses direction. If a safety sensor stops working, the remote control won't work and the motor unit lights blink when you press the remote.
Our garage door opener safety sensor troubleshooting video can help you confirm a problem with the safety sensor. If you determine the safety sensors have failed, replace the sensors using the manufacturer-approved garage door opener part.
Follow the steps in this repair guide and video to replace garage door safety sensors in Craftsman, Chamberlain, LiftMaster and Genie garage door openers.