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Thanks, I'm a novice when it comes to electrics but glad you think the wiring looks ok. I did turn off the trip switch to the boiler before I started, once I was finished I turned it back and the boiler came on but no power to the hive relay. I don't have a multimeter but will get one if...

Hi, I'm trying to replace a Honeywell BDR91 Thermostat with a Hive Active Heating one. The relay box for my Honeywell had wires going into the following (pic attached) N L A B I attempted to match to Hive as follows (pic attached) N L A=1 (common) B=3 (heating ON) However no power seems...