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  1. B

    Is this a borrowed neutral ?

    Best way sometimes is when it takes time as next time if you come across something similar it will make more sense quicker.
  2. B

    PIV units

    The opentherm is good for the likes of a nest thermostat
  3. B

    PIV units

    Opentherm is different to weather compensater. You need to connect to terminal 4 and 3
  4. B

    Is this a borrowed neutral ?

    Could be wrong as picture not overly clear but are the new fusebox rcbos A type or a AC type?
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