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@stem ok, that makes sense, I'm guessing they're the two little white boxes that sit outside the boiler at the top! Think I may just have to book an engineer in for this one then... Cheers all the same!

So close, yet so far... Just went and had a look behind the thermostat and indeed, there is no blue cable there... The whole bundle is also in a grey outer sleeve, whereas at the boiler end it's in a white sleeve, so guessing there's a joint somewhere else in the house, perhaps where the...

@stem thanks very much for your help, that's great, really appreciate that. From your diagram and from the photos of my current setup, I think all I need to do boiler end is move the black cable from B1 to BK2, then connect the currently unused Grey to B1 and we should be good to go...

Based on the above advice and the wiring diagram attached for my boiler, I think that if I connect the Hive as above and it doesn’t work as @Johnmdc and @croftongas say, then at the boiler end I connect the grey cable (currently capped with the terminal block) to the same connection as the blue...

Hi guys, sorry to bring up an old thread but this has basically finished exactly where I am here... I’ve not yet wired the Hive up as per the above (I have brown, black with brown sleeve and grey with blue sleeve) however from looking at the boiler, there is a grey wire that isn’t connected, so...