Possible reasons why your LiftMaster garage door opener isn't working include power issues, remote problems, safety sensor faults, mechanical failures, and logic board issues that prevent opening or closing. The most common reason is power loss, as opener unplugged, breaker tripped, GFCI tripped, or outlet failure cuts power, so check if opener lights are on. Remote battery dead, remote not programmed, or radio interference from LED bulbs in opener can prevent remote operation, so replace battery and reprogram by pressing learn button. Wall console in lock mode disables remotes, indicated by blinking light, so press and hold lock button to unlock. Safety sensors near floor that are dirty, misaligned, or have loose wiring cause opener to not close, with LEDs blinking, so clean and align. Manual lock on door track engaged prevents opening. Broken torsion spring makes door too heavy to lift and opener hums but doesn't move, requiring professional replacement costing 200 to 400 dollars. Disconnected trolley from emergency release cord prevents opener from moving door. Travel limits set incorrectly cause door to stop short. Logic board failure, stripped drive gear, or motor overheating causes no response. Door off-track or rollers binding prevents movement. For LiftMaster specific, MyQ connectivity issues, force settings too low, or RPM sensor failure can cause problems. Try opening manually after pulling emergency release; if door won't lift, spring is likely broken. Regular maintenance like cleaning sensors and lubricating rollers prevents many issues.
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