Many reasons can cause garage door not to open, ranging from power issues to mechanical failures and safety features that prevent operation to protect you. The most common reason is power loss, as opener is unplugged, breaker tripped, or GFCI outlet tripped, so check if opener lights are on and outlet works. Another common reason is manual lock engaged, as some doors have slide lock on track that prevents opening and must be disengaged. Broken torsion spring is frequent cause, as spring counterbalances door weight, and when spring breaks, door becomes too heavy to lift and opener may hum but not move, requiring professional replacement costing 200 to 400 dollars. Misaligned or dirty safety sensors near floor can cause opener to not respond, as sensors must show solid LEDs to allow operation, so clean lenses and align. Travel limits set incorrectly can cause door to think it is already open. Disconnected trolley from emergency release cord pulled prevents opener from moving door, so re-engage trolley. Remote battery dead, remote not programmed, or lock mode engaged on wall console that disables remotes can prevent opening. Door off-track due to hit or worn rollers binding prevents movement. Opener logic board failure, stripped drive gear, or broken cable also prevents opening. Try opening manually by pulling emergency release and lifting door; if door won't lift or is very heavy, spring is likely broken. Check wall switch, as if wall switch also fails, problem is opener or mechanical, not remote.
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