The door has come off its track, or is hanging out of line and will not run true
Why it happens
The door rides on rollers that sit inside a track each side, so a roller that has left its track, or a track knocked out of alignment, stops it running properly. Track alignment is a standing check item rather than an exotic fault: B&D Australia lists it on the service checklist it publishes.
Why it matters
This one is not a wait-and-see fault. A door hanging off its track is named on the business's own published list of what counts as an emergency.
Response
Roller and track lubrication is a named item in the published full service, and emergency callouts are taken around the clock.




