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Topic starter
Don't know much about how they work - thermostat / controller off for hw and heating, boiler still running showing little rad icon and house hotter than the sun! It's like controller not talking to boiler ?
Posted : 20/12/2016 6:58 am
sounds like it - or a fault in a diverter valve as IIRC they have micro switches in them that turn the boiler on and off
Posted : 20/12/2016 7:18 am