Why doesn't my Chamberlain garage door opener work?

Your Chamberlain garage door opener may not work due to several common causes including power failure, remote battery dead, safety sensor misalignment, locked door, broken spring, or logic board failure. First, check power, ensure opener is plugged in, outlet has power, circuit breaker not tripped, and power outage not affecting, as no power prevents all operation. Second, check remote battery, replace battery in remote and try wall button, if wall button works but remote doesn't, remote battery or programming issue, reprogram using Learn button. Third, check safety sensors at bottom of door tracks, ensure LED lights steady, not blinking, clean lenses and align, as misaligned sensors prevent closing. Fourth, check if door is locked or in vacation lock mode, manual slide lock engaged or wall control lock activated disables remotes. Fifth, check for broken torsion spring, try opening door manually by pulling emergency release cord, if door heavy or won't lift, spring broken needs professional repair, opener cannot lift broken spring. Sixth, check travel limits and force settings, if limits incorrect opener may not open or close fully. Seventh, check for stripped gears or worn belt/chain causing motor to run but door not moving. Eighth, check logic board failure due to power surge, may need replacement. Diagnose systematically starting with power and remote.