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Connecting nest to boiler

View the thread, titled "Connecting nest to boiler" which is posted in Boiler Advice Forum on UK Plumbers Forums.

M

Mark cox

We’re trying to connect a nest generation 3 to our ideal boiler. At the moment it’s wired to a honey well R6660D receiver the connections inside are live and neutral. There’s one cable that goes to B and one to C . On our nest control box I can see where we connect live and neutral and I can see where i link live to terminal 2 but what I cannot understand is which cable goes into no 3 as I’ve got 2 cables left which come out of the Honeywell receiver one from B and one from C?
 
Likely to be C as B will be a common supply and C likely to be on. Can you post a photo of wiring?
 

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