Signs the balance is off
If the door creeps down after you lift it, flies up too easily, makes the opener labour or comes down with a bang, Steel-Line puts it down to balance. The fix is a tension adjustment by a professional, followed by a fresh balance check.
Off its guides is another matter. B&D says not to try getting a door back onto its guide rails on your own, since a spring or cable may have gone.
Why tensioning is a job for a door specialist
Steel-Line warns that tensioning your own roller door can cause serious injury or death. Undo the U-bolts and the spring tension can let go, dropping the door hard. If it is slamming, keep people and cars clear and turn the motor off at the power point.
Storm and hail damage
After a big storm, look along the curtain and down both guides. Hail up to 6 cm hit western Sydney in October 2021, and the 1999 storm did its worst between Lilli Pilli and Darling Point. Note where any dents are and whether the door now rubs or catches, and include that when you tell us the job.
Motor fault or door fault?
Start with the simple checks: a fresh battery in the remote, then the wall button. If the motor hums but the door barely moves, the problem may be the door rather than the motor, so say so in the form.
In a blackout, Steel-Line's emergency key release is how you get the door open by hand, and it matters most when the garage has no other way in.
Handy for the door specialist
- The brand on the motor or the bottom rail, if you can see one
- Whether the door has a motor or is lifted by hand
- What changed: a noise, a bang, a storm or a knock from the car
- Whether it is on a garage, a carport or a shed
Roller door repairs around Sydney
Blackouts
The windstorm of 26 November 2025 hit 70,000 Endeavour Energy customers at peak. Find your emergency release before the next one.
Salt air
For coastal homes, Steel-Line suggests lubricating the door at least twice a year, or every three months for the best results. Keep oil out of the side guides.
Servicing
Gliderol wants its own residential roller doors serviced every 24 months, and B&D's care guide says every 12 months for roller doors.
What we would do
If the door has started slamming or creeping down, stop using it and leave it shut if you can. A note on when it started and what changed helps the door specialist come prepared.