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Sounds like you are having the same thoughts as me, and it is not switching off the power to the 3PV when heating is turned off. I am not actually an engineer so I am not sure I am brave enough to take reads besides that I am not even sure where my multimeter is at the moment. If you can...

I didnt think that would make any difference (correct me if I am wrong) because the valve stays open even if I turn the heating off on the programmer.. *sorry I missed that info off my original message*

Hi, I have a problem that I am hoping someone can shed some light on as I have tried various solutions but always end up back in the same situation.. I have a fully pumped system with a 3port valve. The problem I have is that the valve stays fully open all the time so if I just want my...