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Vaillant ecoTEC plus 837, BDR91 to nest Heatlink

Discussion in 'Plumbing and Central Heating' started by C4rlos81, 14 Dec 2020.

  1. C4rlos81

    C4rlos81

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    Hi all,

    I have read through as many similar posts as I can in regards to my dilemma, I couldn't see anything that was similar to mine.

    I have a Vaillant ecotec plus 837 with a Honeywell BDR91 and CM927. The vaillant is connected by a UK mains plug as opposed to it being hardwired with a 3amp fuse at the terminal block.

    I want to replace the Honeywell BDR91 with a Nest Heatlink I have attached some pictures of the current wiring l.

    How would I re-wire this to the nest Heatlink?
    There seems to be 2 live and 2 neutrals. I get the A=2 B=3, but I'm stoked as to he 2 live and 2 neutrals wires
     

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  3. ianmcd

    ianmcd

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    You are correct about a&B to 2&3, but as for the lives and neutrals you will just have to follow the cables and see where they go, as for the plug that is bad and needs sorting
     
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