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How to connect a Nest to a Vaillant 938 ecoTEC plus

Discussion in 'Plumbing and Central Heating' started by Sran, 29 Apr 2019.

  1. Sran


    29 Apr 2019
    Thanks Received:
    United Kingdom
    View attachment 163510 There are a number of videos on youtube about connecting various Vaillant boilers to a NEST but no information on a Valliant 938. I have attempted to draw a diagram of how I think it should be connected. I am not sure if the cable from connection 2 and 3 of the link should go to the RT 230v connector as shown on the diagram or visa versa.
    Is it possible to let know if this is correct?


    Is the correct way to piggy back the power to the Nest Link from the mains in to the boiler and connect 2 and 3 from the Nest to the 24v RT on the boiler?

    Thank you
    Last edited: 30 Apr 2019
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