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
This is the heavy side of garage door work. A technician with winding bars, a set of stands and a measured approach can make a door that was dangerous to move feel light again.
Garage Door Roller ReplacementA roller near the top corner is riding on the lip of the track rather than inside it, and the section above leans back a little…
Garage Door Hinge ReplacementOn the old wood door, one hinge has pulled away from the panel, dragging a screw and a chunk of soft timber with it.
Garage Door Track Repair or ReplacementThe door climbs crooked, one side clearly ahead of the other.
Garage Door Cable ReplacementThe car bumper kissed the door on the way in.
Torsion Spring ReplacementThe door starts to rise, gets about the height of your knee, then shudders and reverses.
Extension Spring ReplacementYou pulled the red cord to open the door during a power cut and it barely moved.
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.