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OK, thanks. I'll plan to get the combined part (as it is cheaper) and see if changing only the actuator (in 10 minutes) will save me having to change the valve (a few hours and more sweat!).

Frost stat sits on pipe between boiler (which is in garage) and house hot water system. Not sure how it is wired - not obvious from the wires around it. Think that might be a red herring. I've established that by twisting the valve spindle I can send new hot water to the HW tank or CH...

My 3 port valve (Sunvic valve and 2701 actuator) is not working I think i.e. HW always heats when CH is on. I assume it is functionally stuck at mid-position. I removed the actuator and it still moves to 3 distinct positions when programmer asks for CH or HW or both. The spindle of the...