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Now then, good news it is working and i have 239v on the white. How? I don't know. Some self healing took place during the night or it was the result of droping the room stat on the floor... Anyhow I must something dodgy around the thermostat but it's clear the programmer and valve are ok...

Thanks all for your replies I very much appreciate it. Now then I have a new programmer and it still doesn't work. I can get 25v ac on the white wire to the mid position valve! Should this be enough to excite the step motor? I don't understand what is going on here as the thermostat holds...

So finally managed to get the multimetre and these were the possible readings: Orange with 230v grey 84v white 0v all regardeless whichever i do with the programmer I guess the programmer is at fault as the white would get up to 230v briefly. would this be the right assessment...

Thanks Andrew I am probably more inclined now to the 3-way valve got cooked. I cannot find my multimetre (my house is a mess!) but I can borrow one tonight. Thanks for the help and I'll keep you posted.

Hello My first post here, thanks for your help in advance. I need help to understand which component of my heating system might have failed – everything seems to be working but the radiators don’t warm up after a small incident last night. I have a conventional boiler with an electric cylinder...