1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Wiring Nest heatlink to Vaillant ecoTEC 937

Discussion in 'Plumbing and Central Heating' started by Droler, 8 Oct 2016.

  1. Droler

    Droler

    Joined:
    8 Oct 2016
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi,
    1st post and I'm a bit of an amatuer (can do basic wiring) so be gentle...
    Basically I need to wire a 3rd generation Nest Heatlink to a Vaillant EcoTEC 937. Could someone please relate the Nest instructions to the boiler wiring diagram for me? I'm not sure which Nest instructions I should be following, the left (230v combi) or the right (low voltage combi).

    Also when wiring in the power to the Nest unit is it ok to run it from the power cable connection off the circuit board?

    Many thanks
    nest 2.jpg IMG_20161008_163007.jpg ecotec 937.jpg
     
  2. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,421
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Hope you are going to do your 26.9 checks when you. Put that boiler cover back on.
     
    • Like Like x 2
  3. Droler

    Droler

    Joined:
    8 Oct 2016
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Is this something to avoid as a DIYer then?
     
  4. Dan Robinson

    Dan Robinson

    Joined:
    1 Jul 2007
    Messages:
    56,042
    Thanks Received:
    9,421
    Location:
    Hertfordshire & London
    Country:
    United Kingdom
    Well, seeing as you're this far.... you might as well remove the red link wire and follow the second example from the nest diagram, then get the boiler serviced by an rgi.
     
  5. ben9

    ben9

    Joined:
    9 Oct 2016
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
     
  6. ben9

    ben9

    Joined:
    9 Oct 2016
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    @Droler, the boiler looks similar to mine. Googled couple of hours and so far I have found out :Boiler:remove link between 3(RT)&4 and connect to Nest 2(heating on)&3(heating off),
    Boiler:L=Nest L
    Boiler N=Nest N
    Boiler E=Nest E
    I think It should work.
     
  7. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page