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Thanks Chris - I sorted it, looked into the wiring box and actually straight forward

I hoping someone could steer me on exactly which connections to connect .. thanks

Don't ask me why I want to do this as it is a long story best left for a pint or two... ; ) but I have three Nests thermos, each has its own zone valve/circuit. (Temporarly) I want to to control all three zones valves/circuits with just one of these Nests thermos - whats the wiring way to...