Possible reasons why your automatic garage door isn't working include power failures, mechanical breakdowns, safety sensor issues, and electronic failures that prevent door from opening or closing automatically. The most common reason is power loss, as opener unplugged, breaker tripped, or GFCI outlet tripped cuts power to opener, so check if opener lights are on and outlet works. Broken torsion spring that counterbalances door weight is frequent cause of door not opening, as when spring breaks, door becomes too heavy at 150 to 300 pounds for opener to lift and opener may hum but not move, requiring professional replacement costing 200 to 400 dollars due to high tension danger. Safety sensors near floor that are dirty, misaligned, or have loose wiring prevent door from closing, with receiving sensor LED blinking and opener light blinking 10 times, so clean and align. Manual slide lock on door track engaged physically prevents operation and must be disengaged. Disconnected trolley from emergency release cord pulled disconnects door from opener. Remote battery dead, remote not programmed, or lock mode engaged on wall console disables remotes. Door off-track due to hit or worn rollers binding prevents movement. Cable broken or off drum jams door. Logic board failure, stripped drive gear, motor overheating, or RPM sensor failure prevents operation. Travel limits set incorrectly cause door to stop short. Try opening manually after pulling release; if door won't lift, spring likely broken. Unplug opener 30 seconds to reset board.
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