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Thanks Simond. The Boiler is in the attic (which is v cold indeed). And yes there is a small radiator icon (flashing which I think indicates Anti Cycling mode active) on the LCD display, Tipper, thanks, I mean that I turned the Radiator dial to off (Summer setting) So no heating but hot...

Hi. I have noticed that my Vaillant ecoTEC plus 824 is firing up on its own supplying heating to my radiators even when I have set the Drayton Digistat Thermostat off. I had the system installed last Dec, it was a mild winter then. But now with a bitter winter it is firing up supplying heat...