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Discuss Nest install - existing roomstat wiring in the Central Heating Forum area at PlumbersForums.net

I have a google nest (3rd gen) to replace the existing wired roomstat in my new property.

Having had a quick look at the wiring it looks like it might be a high voltage one I have? (nest says something about not being compatible with high voltage wiring?)
It has two wires plus an earth. There is a third wire that isn't connected to anything.

The boiler is a combi alpha evoke 33.

some people say it's just a case of connecting the existing wires to the nest wall plug, others say the nest heat link may be required.

i'm competent in doing the wiring if that's all that is required. however if anything is required to be done a the boiler end i'll get one of our gas engineers to do it.
 

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