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The valve was replaced about 2 months ago as it was thought that this was the cause of the problem. So unless i've got a dodgy one... If I turn the CH off and ask for HW then the valve moves and the CH comes on. I can hear the valve move back to the HW open position when I switch everything off.

I've recently moved house and got a problem with my hotwater heating. The 3 port valve will not switch to the hot water circuit and I'm pulling my hair out over it. I've checked every component (other than the boiler) and they are all individually functioning correctly (cylinder stat, V4047...