What actually breaks
Five things account for most calls: a torsion spring, a cable, the rollers and track, the photo-eye sensors at the bottom of the tracks, and the opener. A spring goes with a bang and the door is suddenly too heavy to lift by hand. A cable comes off its drum and one side of the door drops lower than the other. Knock a sensor out of alignment with a bike or a bin and the door refuses to close, reversing every time. When the opener hums and nothing moves, the gear kit inside it has usually stripped.
Each of those has its own page, and the branch pages for springs, openers, parts, installation and new doors are linked below. This page is the branch, not the repair manual.












