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 movement is limited
Possible opener, trolley, gear, balance, track, or door-resistance issue.
Door reverses before closing
Possible sensor, travel-limit, obstruction, seal resistance, or opener-setting problem.
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 enters
Possible bottom seal, side seal, threshold, floor contact, or alignment problem.
Repairs keep returning
Possible system-wide age, incompatible parts, damaged sections, or replacement need.