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The old controller had a diagram which indicated the correct wire for Hot Water and Heating. All wired up and working! Thanks for your help picasso!

oh... good point. I probably didn't think that through. So yep the boiler supplies heating and hot water. I guess I should be looking at dual channel? So in that case, should it be: old:1 -> Hive's 3: Hot Water on old:2 -> Hive's 4: Heating on Does 1:Hot Water off and 2:Heating off need to...

Hi there, I'm trying to figure out the wiring from old timer controller to my new Hive Thermostat. I've an ideal logic heat H18 boiler which has an old timer controller with 4 wires, diagram looks like this: And in real life this looks like this: The Hive Wiring diagram seems to be...