If The door will not lift and you heard a loud bang from the garage.
Then Torsion spring replacement.
A snapped spring leaves a visible gap in the coil; the opener should stay off until it is replaced. Torsion Spring Replacement
Inspection, adjustment, sealing, and section-level repairs.
Repairs
Preventive work is unglamorous, and it pays for itself in doors that do not fail. Lubricating the moving parts, tightening the fasteners, checking the balance and testing the safety reversal all fit in a single unhurried visit.
Garage Door Safety InspectionYou moved in three months ago.
Garage Door Tune-UpTwice this week the door started closing, stopped a metre from the floor and reopened on its own.
Off-Track Garage Door ResetOne side of the door hangs a hand's width lower than the other.
Garage Door Panel ReplacementFrom outside, the horizontal groove between two sections now steps sideways by a centimetre.
Garage Door Bottom Seal ReplacementWith the door closed and the lights off, a bright line of daylight runs along the floor from one side to the other.
Garage Door Perimeter WeatherstripEvery time the door closes there is a rubbing squeal along one side, and the flexible fin has folded under itself and torn.
Garage Door Manual Lock RepairYou pushed the slide bolt across like always, but tonight it stops short of the slot in the track and springs back.
Which fix fits?
Tap a situation. The answer opens here.
If The door rises a few centimetres, stops and settles back down.
Then Spring and opener force check.
Often the spring has lost tension and the opener is protecting itself; balancing the door usually resolves it. Torsion Spring Replacement
If The opener runs and the chain moves but the door stays put.
Then Trolley and drive gear repair.
The trolley may be disconnected or the drive gear worn; both are common, repairable faults.