Note: garage door openers manufactured after January 1, 1993, are required by federal law to be equipped with a reversing mechanism and a photo eye or edge sensor as added measures of safety to prevent entrapment. If your system does not have these features, replacement of your automatic operating system is recommended.
With the door fully open, push your garage door opener’s transmitter or wall button to close the door. Wave a long object, such as a broomstick, in front of one of the door’s photo eyes so it “breaks the beam.” The door should reverse.
If it does not reverse and reopen, pull the broomstick out of the path of the closing door. Close the door. With the door in the closed position, clean the photo eyes with a soft, dry cloth. Gently adjust the photo eyes by hand if they appear to be out of alignment. Open the door and repeat the photo eye test. If the door does not reverse and reopen, the door should be serviced by a trained service technician.