In article , Andy Morris at
wrote on 29/4/04 10:30:

I have a 4043H1056 valve that does not automatically shut when power is
removed.
The spring return seems to have failed. - Does this require a whole new
valve unit, or can just the actuator be replaced?

You can buy a replacement "head" for this from a plumbers' merchant or
heating supplies shop.

It's quite easy to replace it with no risk of water loss - take the cover
off and there are two screws holding the head to the valve body. Check that
the valve itself hasn't jammed before you go shopping, if it has then you
will need to change the whole thing :-(

Also, the manual lever on the valve does not seem to grab anything. There is

Since the valve is already wide open there's nothing for it to do.

--
Cheers,

Derryck