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I semi-solved my problem. Turns out my initial investigations on the Honeywell box in the loft had left one of the cables with a bad connection so the 3-port valve was not getting the signal.:cautious:Shorting the old room thermostat connections now kicks the heating in.(y) Only issue now is...

Thank Stem, That is what I thought needed to be done and had attempted to do without success. The room thermostat that was removed only had a 2 core cable the led back to the wall so no permanent live. Sadly the stat is currently "missplaced" so I could not tell you the model, i think you could...

Hi guys, Hoping I can sort this out without bringing in a tradesman.... I'll try to include as much info as possible. I have a Suprima boiler and Hive thermostat which I installed soon after moving into my new house, the whole system worked well over the winter for both CH and HW. The system...