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
Springs
A spring can look fine and still be finished. Coils that have lost their gap, rust pitting along the wire and a door that needs a shove to start moving are all signs. Inspection is part of every hardware visit.
Garage Door Roller ReplacementHalfway up, the door hesitates and the opener strains before it carries on.
Garage Door Hinge ReplacementWith the door closed and a flashlight on the inside face, one of the hinges near the edge has a crack running from the screw hole…
Garage Door Track Repair or ReplacementAfter a decade of slushy winters the bottom foot of the track is flaking rust.
Garage Door Cable ReplacementAfter years of slushy winters the cables look thinner near the bottom brackets, with rust streaks running down the door where…
Torsion Spring ReplacementOne side of the door sits higher than the other in the tracks, and a lift cable is hanging slack or has jumped off its drum.
Extension Spring ReplacementThe home inspector's report on the house you are buying flags the garage door: extension springs with no safety cable running…
Garage Door Balance AdjustmentWith the door closed, daylight shows under one bottom corner and the seal is squashed flat at the other.
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.