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    Installation of Nest 3rd Generation (Vaillant ecoTec Pro 28)

    Yes, my bad. Wired it up this morning and saw the symbol. Thanks for your expertise.
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    Installation of Nest 3rd Generation (Vaillant ecoTec Pro 28)

    Nice one! That's a great help. You'd think they'd put a place for the earth to go (rather than loose), everything else has been designed well enough. Also, what's the grey wire?
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    Installation of Nest 3rd Generation (Vaillant ecoTec Pro 28)

    Sorry to ask another question like this. Can someone help with mine? It doesn't look like any other setup pictures. The live is looped from 2 to 3 and the black is going into 3 (not sure what that wire does exactly, it's marked "call") It's from a Drayton Digistat SCR going into the Vaillant...
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