A Chamberlain garage door opener typically stops working due to misaligned or obstructed safety reversing sensors (photo-eyes) preventing the motor from closing the door, a tripped circuit breaker cutting power, stripped internal nylon drive gears from lifting heavy unbalanced doors, or a blown internal transformer fuse. Additionally, snapping torsion springs or remote control battery failures can mimic total opener failure. Safety Warning: High-tension springs store lethal force; never adjust or repair springs without proper winding tools. Verification: Check sensor LED alignment indicators and test door balance manually using the red release rope.
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