The roller door is heavy to lift and the motor strains
Why it happens
Roller door spring tension has dropped after thousands of cycles, so the motor is carrying more of the weight.
Why it matters
The opener wears out faster, and the door may become too heavy to open by hand in a power cut. Signs to watch for: door drops when released halfway, motor slows or stops, door hard to lift manually.
Response
Thom re-tensions the spring where it is sound, or replaces it, then checks the motor's force and limit settings.




