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Also as an intrim thing to get some heat into the house could I move the valve from auto to mid, would this work or is that for something totally different? Cheers

Ok and thanks for your help.

Gavinda, thanks really appreciate your advice but I don’t have a volt meter as this is not my thing really, When I turn the thermostat on the tank to 0 the HW light on the 3 way valve goes out, CH light stays on but boiler dosn’t fire up, as the valve is only about £40 would it be worth just...

Have turned thermostat on tank to 0 but CH not kicked in, so no it does not seem to.

Hi, sorry if I sound confused but am a novice at this! Have a problem with CH in that it only seems to work while the HW is on, if I turn HW off at the programmer then the boiler cuts out and only comes back on when I turn HW back on (then not all the time as I think that if the HW is up to temp...