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  1. J

    Vaillant EcoTecplus831 turning on when Thermostat set to off

    My boiler is randomly turning on, to heat the rads, when the wireless controller is set to OFF. I had the 'stat set to auto and it was behaving and coming on in the evening and morning but today it randomly came on in the day when the 'stat was set to OFF and the room temp was well above the...