In article ,
Stephen wrote:
The problem is that the box of electronics controlling it has got two
relays. I imagine one for up and one for down. The "up" relay is
sticking so that the door will not open. I have opened the box of
electronics and given the relay a tap and it is working for now but I
expect it to stick again soon. How can I prevent it from sticking in
the future? Is there anything I can do? I guess I really need to get
out the soldering iron and replace it before it fails completely.

It could be sticking due to a mechanical problem in which case simple
replacement should sort it. RS Components etc should do a suitable
replacement.

It might be sticking due to the contacts arcing and welding themselves
together - in which case the cause of this overload needs to be rectified.
There's usually some form of snubber network to prevent arcing when the
contacts open on an inductive load like a motor.

--
*Procrastinate now

Dave Plowman London SW
To e-mail, change noise into sound.