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Thank you! I have some heating now, by turning the cylinder stat UP and the boiler controls DOWN. I think any further steps will be taken after Christmas!! thanks for all the advice. :)

Thanks very much! Those wiring diagrams are most excellent. So I'm guessing I am going to find a lack of power on the orange wire from my Diverter Valve when the hot water is up to temperature, regardless of room thermostat setting. I will check it out later.

Thanks for the replies. I have turned the cylinder stat up. (I hadn't lowered the boiler temperature one... I am not sure what that actually does!) I do have a multimeter, and I'm not afraid to use it. In addition, I can confirm that *some* sort of signal gets to the valve, because I can...

Someone has not helpfully advised me that it could be the actual motorised valve, rather than the actuator head that was the problem. I have ordered a repalcement, but in the meantime.... over Christmas... Is it possible to "force" the valve open in fully working order? I never heat the...

Hi, I wonder if someone could offer me some advice regarding my central heating system? Everything was working fine up until about a week ago. Suddenly one evening, I noticed that there was hot water, but no heat to the radiators. It was very cold, and it was a week before Xmas, and I have...