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Diagnosing a Garage Door That Will Not Open

A garage door that will not open presents the same way regardless of cause. The diagnostic value comes entirely from the order in which possibilities are eliminated.

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Power and motor

The first branch separates electrical from mechanical. If the motor does not run at all, the problem is power, the logic board, or the wall control. If the motor runs but the door does not move, the trolley is disconnected or the drive gear has stripped, a common failure on chain drive units past a certain age.

Safety sensor interlock

Photoelectric sensors near the floor prevent closing when the beam is broken. Misalignment, lens contamination and damaged wiring all present as a door that opens but will not stay closed, often with a diagnostic flash code at the motor unit. This branch is checked early because it is both common and free to resolve.

Mechanical freedom

The decisive test. With the opener disconnected, the door is lifted by hand. A door that moves freely narrows the problem to the opener and its settings. A door that binds or will not lift moves the diagnosis entirely to the counterbalance system, and the opener becomes irrelevant.

Counterbalance inspection

A broken torsion spring is visible as a distinct gap in the coil. Extension springs fail more ambiguously and are assessed by comparing tension between sides. A door with a failed spring carries its full weight unassisted, which is why powered operation is stopped at this point rather than continued.

Cables, drums and track

Cables are checked for fraying at the drum and for even spooling. A cable off its drum leaves the door visibly out of square in the opening. Track is sighted for bows and for loose mounting hardware.

Opener configuration last

Travel limits and force settings are examined only after mechanical freedom is confirmed. Increasing force to overcome a mechanical bind is the most damaging shortcut available in this trade. It masks an unsafe door, defeats the purpose of the force setting as a safety mechanism, and shortens opener life considerably.