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Wouldn't orange be live whenever the boiler is on, hot water or heating? From Honeywell:- Valve wiring configuration is: White = Heating on Blue = Neutral Grey = Hot water off Green/Yellow = Earth Orange = Boiler and pump live. So did you mean white, which is where I'll try...

The bungalow I've recently moved into had to have the heating on to get hot water, the indirect hot water cylinder was in parallel with the central heating with a wax thermostat to shut it off when it reached temperature. This was inconvenient and frankly useless. Today I added a V4073A...