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Thanks for all your help I'll try it out over the weekend.

Hi I've got a Main Combi 30 Eco which currently only has a timer fitted to its fascia and no thermostat , Im now looking at fitting a Hive Gen 1 system to it ( heating only model ) I'm assuming that to do so i need to take out the yellow loop wire between bk1 and bk2 on the combi and wire them...