Your Chamberlain door opener may not be opening your garage door due to several reasons including power issue, remote issue, safety sensors, broken spring, or mechanical failure. First, check power, ensure opener plugged in, outlet has power, and breaker not tripped, as no power prevents operation. Second, check remote battery and programming, replace remote battery and try wall button, if wall button opens door but remote doesn't, remote needs battery or reprogramming using Learn button on motor unit. Third, check safety sensors, though sensors primarily prevent closing, some models prevent opening if sensors shorted, ensure sensor LEDs steady. Fourth, check if door is locked or in lock mode, manual lock engaged or vacation lock on wall control activated disables remote opening. Fifth, check for broken torsion spring, which is most common reason opener cannot open door, pull emergency release cord to disengage opener and try lifting door manually, if door is extremely heavy or won't lift, spring broken requires professional replacement, opener motor not strong enough to lift door with broken spring. Sixth, check if trolley disengaged, if emergency release pulled, trolley disengaged and motor runs but door doesn't move, re-engage trolley. Seventh, check for stripped gears or broken belt/chain, motor hums but door doesn't move indicates drive failure. Eighth, check travel limits, if limits set incorrectly opener thinks door already open.
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