Thanks again.
The microswitch in the valve was jammed. With a few clicks it fixed its self.
Probably on it's way out, but I'll know what the problem is if it occurs again.
Thanks for all your help in sorting this one out.
Ian
zone valves are a honeywell for the DHW and a Danfoss for the HTG.
if I manually switch these to open I can hear the waterflow change (and in the case of the HTG the radiators get hot). So I think the valves are OK.
Can you manually switch the valves to off or just on?
Thanks,
Ian
Thanks Tibbot,
I think you've set me on the right track. I believe I have a wiring fault. (goodness knows why the previous owners never picked up on it!)
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