Probably failure of that that caused the initial fault as normally a limit
switch would stop the motor.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
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"Harry Bloomfield" wrote in message
...
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.