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Swap Digistat 3+ for a Hive SIngle channel (Combi boiler)

Discussion in 'Plumbing and Central Heating' started by PeteC12, 16 Nov 2018.

  1. PeteC12

    PeteC12

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    Hi Folks,
    We have a Worcester Bosch 37CDI combi boiler controlled by a Digistat 3+ controller.
    We are looking to replace the controller with a Hive single channel unit.

    But my Digistat controller only has 2 wires connected in the wall box, as per attached picture, red to 'C' and Yellow to 'ON' , nothing at all to the 3rd 'OFF' connection.

    Looking at the Hive wiring (pic from another post) can i simply move:
    Digistat Red (C) to Hive (N)
    Digistat Yellow (ON) to Hive CH ON(3)

    Many Thanks for your thoughts.
     

    Attached Files:

  2. picasso

    picasso

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    Is the blue wire connected to NS at the boiler ? if it is you connect blue to hive neutral, red to hive live and yellow to hive 3, you also need to put a link between live and 1.
     
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  4. PeteC12

    PeteC12

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    Hi Picasso,
    Thanks for the response, just had a chance to follow the wiring back to the boiler in the airing cupboard.

    I have found a junction box in the airing cupboard - wiring picture attached, looks like the blue wire is not connected at either end - digistat controller or past this junction box - both ends just hanging in fresh air.

    From the Digistat wiring to this junction box and on to the boiler it now looks like:
    Digistat Red (C) to Boiler (Grey)
    Digistat Yellow (ON) to Boiler (Black)

    I am now thinking that my best approach is to effectively ignore/bypass the Digistat unit altogether and place the Hive Controller in the airing cupboard - situated beside this junction box.
    (just hoping the WiFi signal carries up there..)

    Then taking your advise above, wire as follows:

    Junction box (Grey) to Hive (L)
    Junction box (Black) to Hive CH ON(3)

    Link Hive (L) and Hive (1)

    Am i still short of a Live power feed? without the Blue connected anywhere?

    Should I also run an additional Earth cable from Hive Controller Earth point back to the Junction box earth cables?

    Many thanks for the help so far.
     

    Attached Files:

  5. picasso

    picasso

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    You still need to find a neutral, try stripping the flex back a bit as it might be 5 core as its unusual to see black and grey on 3 core.
     
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