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hey 75pete Thanks for the reply. It's a Tado internet connected solution (so no click, but indication online that it's set to on at current temperature). I've been assured that the thermostat is sound, but I think shorting of CH circuit (connecting it to live) bypasses the thermostat anyway?

Hey So I need your expert advice. I have an Ideal FF250, in an pumped system, with a header tank (though no overflow vent) and a HW cylinder. It's a heat-only sort of boiler. It has two honeywell two port valves, and has been connected to a tado. On switching the heating back on, I've...