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    Vaillant ecoTEC Exclusive - no heat required?

    Hi There, After the few days of sun we've had, I came home to a chillier than usual house today. Thermostat is lit up requesting heat, and the indicator light next to the boiler is lit, however according to the boiler, "no heat demand", and it's reading 75 degrees. Boiler is just shy of 4...
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