Harry Bloomfield wrote :
I have the same unit they keep advertising on TV by that builder type bloke,
but it is not a Crocodile supplied unit, though the identical
electrical/mechanicals.

Today it opened further than it is supposed to do, jammed itself on the roll
and the motor kept running and seems to have done itself some internal
damage. I managed to release it/unwind it and the door shot down to the fully
closed position. Motor makes a noise, when pressing the open button, but the
door hardly moves as if something on the drive has stripped.

So I'm looking for some information on the internals of the drive system. The
spindle is around 4.5" diameter and includes the motor and obviously must
have some sort of concentric gear drive, which I suspect is the issue.

The manual open/close drive also does nothing at all, no resistance to
turning the manual drive rod at all.