Opener runs or hums but the door does not move

Separate a disconnected trolley, a stripped gear/sprocket, a jammed trolley or a door problem (lock, broken spring). Door-side spring problems go to a door technician.

Cross-checked ~60 min moderateBrands: All

Before you start

Unplug the opener and disconnect the battery backup before opening the cover.
Use the emergency release only with the door closed or supported; a door with a broken spring can fall.
Never loosen torsion spring set screws, unwind springs or touch lift cables: refer to a trained door technician.

Diagnostic steps

Unlock all 5 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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