In an earlier contribution to this discussion,
Daniel wrote:

Hi,

Ok thanks for the info thus far. Tonight i removed the actuator from
the valve. I can turn the valve easily left and right with my
fingers. So it looks liek it's the actuator? To test this I went
and switched the keypad from HW to CH and got someone to watch the
actuator to see if it moved - It didn't move.

Would it be worth taking the cover off the actuator and checking this
spring? I'd like to make sure it's the actuator and not the keypad,
or something inbetween.

Thanks for the help so far, you guys are life (and £££) savers


My guess is that the actuator is stuck in the CH position, and the spring
return isn't working. Sometimes, they can just get confused - and need to be
reset.

The first thing to do is this: With the actuator removed from the valve, but
still connected by its wires, get someone to observe what it does when you
remove *all* power to the heating system. [You should have an isolator
switch somewhere for the heating - switch *that* off, not just the
programmer].

If when you do this, you see and hear it return to the HW position, you may
have fixed it. Refit it to the valve, switch on and see what happens.

If it does *nothing* when all power is removed, see whether you can move the
actuator with the manual lever. You should feel some resistance from the
gearbox as it moves - and when you release it, it should move back under
spring return.

It the lever flops about without moving anything and/or if the spring
doesn't return it, the chances are that it's shot. They can sometimes be
repaired - but for the sake of 30 quid or so it's usually best to replace
them.

Make a careful note of the wiring before disconnecting it. There are 5
coloured wires, and the replacement must be connected exactly the same.
--
Cheers,
Set Square
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