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Bumping to the top to see if anyone else has an opinion...

Thanks for that. Fortunately the junction/connection box is labelled with wire colours etc. but I will check out the diagram anyway. If it is a wiring fault any idea what it could be ? Could the heating and hot water valves be wired into the wrong/each other's connections (hence the...

Setup: Santon unvented hot water cylinder (170L), Potterton Suprima (40 ???)conventional boiler with frost thermostat, no room thermostat, radiator controls/thermostats. Landis and Staefa RWB9 electronic control panel in ground floor kitchen, boiler and hot water tank in loft above 1st floor...