Your LiftMaster garage door opener keeps going back up after closing because safety features are detecting an obstruction, misalignment, or excessive force needed to close, causing it to reverse to prevent damage or injury. The most common cause is misaligned or dirty safety sensors, the photo-eyes near floor, where if beam is blocked or not aligned, green light flashes and door reverses. Check sensors for steady lights, one amber and one green, clean lenses, and ensure no spider webs or debris blocking beam. Second cause is travel limits set incorrectly, where down limit is set too far, causing door to hit floor and think it hit obstruction, so opener reverses; adjust down limit screw counterclockwise slightly. Third cause is close force set too low, so opener thinks door hitting something when friction is high, especially in cold weather or if rollers need lubrication or gutters overflow causing water and rust on tracks. Fourth cause is door binding in tracks due to bent track, loose bolts, or rollers off track, causing excessive friction that triggers force reversal. Fifth cause is manual lock or slide lock engaged on track that opener cannot overcome. Sixth cause is broken spring making door heavy, so opener cannot close and reverses. Inspect door manually after pulling emergency release to see if it moves smoothly halfway. Adjust limits and lubricate rollers with silicone to fix.
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