If the garage door reverses when closing after only traveling down an inch or so, something is probably blocking the beam between the two safety sensors at the bottom of the rails, or the sensors aren't aligned. Watch our safety sensor troubleshoot video to determine whether the sensors work; replace them if they're broken.
If your garage door reversing when closing after it's more than halfway down, you may need to adjust the downforce setting or adjust the door tracks so the door doesn't bind up on the way down.
