New install of Nest (3rd gen) with Greenstar 25i - Help - Not working

Discussion in 'Plumbing and Central Heating' started by MattT, 3 Dec 2018.

  1. MattT

    MattT

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    Hi All,

    I finally got around to installing my Nest 3rd Gen, replacing a wireless digistat RF1.

    I also seem to have a double set of live/neutral wires and 3 for earth, I copied this exactly from the old system/wiring matching the numbers. There was that loose blue wire before unless it came up when I removed the lid...which seems odd given there is not one thread.

    My heatlink powers up, connects to the nest and 'clicks' when I ask the nest to warm the flat up but the boiler doesn't react. I have also set the timer on the boiler to ON.

    Pictures of existing wiring for the old system, the nest and the boiler front panel.

    Any help/checks welcomed before I freeze ! :/
     

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  2. MattT

    MattT

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    Do I need to bridge 1 and 2?
     
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  4. ianmcd

    ianmcd

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    you have it wired up wrong the nest switches the heating between terminals 2 & 3, you are using 1 & 3
     
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  5. MattT

    MattT

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    Aha, lets give that a go. Thank you !
     
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  7. MattT

    MattT

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    Perfect, that was it. Much appreciated.
     
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  8. DIYnot Local

    DIYnot Local

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