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Yes from my understanding the oil combi has 2 connection one for CH and one for DHW, which would be the 5 core cable currently from boiler to control programmer. I know the DHW links into nest position position 6. The CH wire at the moment goes from boiler via a black wire to block connector...

Hi apologies I should have included that in the intial info. This one: "The other is all motorised valves, hot water storage, pumps, and heat exchangers are inside the boiler, and the controller connects direct to boiler." Oil run combi boiler is the boiler. Nest generation 3 would be the...

Hi Chris, Thanks so much for the reply. All wiring has been like that since it was installed by so called 'professional' when boiler put in. If the black wire is connected to the call for heat on the nest heatlink will it work?

Hi all, Apologies another nest thermostat query re installation. Reading the other pages has been helpful and think I'm nearly there. Current set up: from mains fuse box 3 core cable to isolation switch - then a Live and Neutral come off and go to control panel (currently centaurplus c27), a...