I just replaced two broken straps on my roller garage door. They look like below (when not broken).
Everything went well (tested with manual crank up and down etc..) but then I closed the door fully via the motor. It did not detect that it had reached the bottom and the motor carried on going. I wasn't quick enough in stopping it and the straps were smashed to pieces. Lo and behold - exactly as per the original damage. So now I know why they were broken!
As the straps only cost me £20, I'm inclined to have another go at this, as long as I'm better prepared for the closing problem.
So here's the question: Why did the motor not stop? Do I need to do something to reset the system to the fully closed position? Does it sound like an electrical fault, or did I just miss a step?
The door is pretty old. Installed by previous home owner about 10 years ago. I don't know the manufacturer or model. The sticker on the unit is for a distributer/fitter. I rang them and they were not helpful. All I know is it's a pretty basic insulated roller door with 55mm slats. It has a simple remote control and obstruction detection for the motor.