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  1. M

    Nest on combi boiler vaillant ecotec pro 28

    Hi all, I want to buy nest 3rd generation and install myself on my boiler but when I look at the wiring on nest instructions I can see that there are 2 ways to do so. One is 230v and one is dry contact. i have attached a picture of my motherboard. I have to wire L & N from 230V to N & L to...
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