Door feels unusually heavy
Possible spring tension, cable, balance, or resistance problem.
Door opens crooked
Possible cable, drum, roller, spring, or track issue.
Opener hums without lifting
Possible opener strain, trolley problem, resistance, or poor
balance.
Door reverses while closing
Possible sensor, obstruction, travel-limit, seal, or force-setting
issue.
Door shakes or grinds
Possible roller, hinge, track, alignment, or opener wear.
Water or daylight enters
Possible worn weather seal, poor floor contact, or alignment issue.
Panel is bent or separated
Possible sectional damage affecting travel, sealing, and support.
Door will not secure
Possible urgent closing, opener, alignment, or access-control
issue.