Door feels unusually heavy
Possible spring, cable, drum, balance, or mechanical-resistance issue.
Door opens crooked
Possible cable, spring, roller, hinge, bracket, or track problem.
Motor runs but door barely moves
Possible opener strain, trolley issue, poor balance, or blocked movement.
Door reverses before closing
Possible sensor, travel-limit, track obstruction, seal resistance, or opener setting.
Grinding, scraping, or shaking
Possible roller, hinge, track, alignment, opener, or loose-hardware wear.
Remote or keypad is unreliable
Possible battery, programming, receiver, range, control, or opener issue.
Water or daylight under the door
Possible bottom seal, side seal, threshold, floor-contact, or alignment problem.
Panel is bent or damaged
Possible panel repair, hinge review, track check, reinforcement, or replacement need.