How do I reset my garage door?

To reset your garage door and opener system to restore function after malfunction, power loss, or sensor issue, you need to reset opener logic board, re-engage trolley, and reprogram limits and remotes. First, close garage door manually if possible, and ensure no obstructions. To reset opener logic board, unplug garage door opener from power outlet for 30 seconds to a minute, or flip breaker off, then plug back in, which clears error codes and resets board. If trolley is disconnected from emergency release cord pulled, re-engage by pulling emergency cord toward door or pulling cord toward opener and then running opener until trolley clicks and reconnects to door arm. Reset travel limits if door doesn't open fully or close fully, by adjusting limit screws or using electronic limit setting on newer LiftMaster openers by pressing and holding limit buttons. Reset safety sensors by cleaning lenses and aligning until LEDs are solid. To reset remotes and keypad, press and hold learn button on opener for 6 seconds until light goes out to erase all remotes, then reprogram each remote by pressing learn button and pressing remote button within 30 seconds. If wall console has lock mode engaged, press and hold lock button for 5 seconds to unlock. Test door operation after reset by opening and closing several times. If reset fails, logic board may need replacement costing 150 to 300 dollars professionally.