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So does that mean that No.1 is left with no wire if the loop is not required? We are findjngvtgd underfloor heating is permanently on, would the loop be causing this ir would it be something else?

Very random.....our downstairs has water under floor heating has 4 zones, one per room. Weirdly one room is permanently on even when the thermostat is turned down and another room is permanently off even when the thermostat is calling with the light on! I've changed both the thermostats and the...

Nothing obvious but have taken all the wires out and rewired......now working :D Thank you both(y)

If it helps here is the wiring diagram from the old honeywell thermostat

Hi, picture now attached....hopefully:rolleyes: I've removed the live loop at one end.

Hi, so I did that and it shorted the fuse:( heres a picture of what I think you suggested

Hi Stem, thanks 4 your help. We have water underfloor heating run by an oil boiler. Would the switch live go into the open or closed? Or does it need a loop? Thank you

Feel this should be simple but keen double check before I wire as I'm replacing the thermostat but also moving to a digital one. Live is obvious but insure what goes into the digital thermo open and closed holes :/ would really appreciate the help and attached the pictures of the current...