Your garage door opener may suddenly stop working due to several common sudden failures related to power, springs, sensors, or electronics that interrupt operation without warning. The most common sudden failure is broken torsion spring that counterbalances door weight, which often breaks with loud bang and causes door to become too heavy to lift, with opener humming but not moving, requiring professional spring replacement costing 200 to 400 dollars. Power outage, tripped breaker, GFCI tripped, or opener unplugged causes sudden stop, so check if opener lights are on and outlet works. Safety sensors can suddenly become misaligned from being bumped by car, bike, or foot traffic, causing LEDs to blink and door to refuse to close, so clean and realign sensors until solid. Emergency release cord may have been pulled accidentally, disconnecting trolley and preventing opener from moving door, requiring re-engagement. Remote battery can die suddenly, and lock mode on wall console can be accidentally engaged by pressing lock button, disabling remotes, indicated by blinking light, so hold lock button to unlock. Logic board can fail due to power surge after storm, causing opener to have power but not respond, requiring board replacement costing 150 to 300 dollars. Door can go off-track from hit, causing binding. Cable can snap suddenly, jamming door. Extreme cold can thicken lubricant and cause binding. To diagnose, try manual operation after pulling emergency release; if door won't lift, spring likely broken. Unplug opener 30 seconds to reset board.
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