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Wiring Nest with Vaillant EcoTec Pro 24

Discussion in 'Plumbing and Central Heating' started by Henry_neves, 2 Apr 2018.

  1. Henry_neves

    Henry_neves

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    Hi there, hoping somebody can help...

    My friend who's an electrician wired up my new Nest Heat Link, and we used the advice on this thread (https://www.diynot.com/diy/threads/...3rd-generation-vaillant-ecotec-pro-28.454693/) as we presumed the two boilers would be the same, even though mine is a 24 and that was a 28.

    The boiler still produces hot water as the Nest doesn't control that, but the Nest is not firing up the boiler when a request for heat is sent. Even when it's manually set. The Heat Link has a green light and communicates with the thermostat no problem, but that's about it.

    The only difference from the aforementioned thread was that my friend said the Nest did have an Earth terminal so he used that. Apart from that, we followed the wiring diagram from the Dry Contact diagram (as recommended) with the grey and black cables from the boiler go into 2 and 3.

    Previous to installation, I had exactly the same Drayton Digistat thermostat.

    Could anybody help?

    Thanks very much

    Henry
     
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  3. Henry_neves

    Henry_neves

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