Thermostat wiring

Discussion in 'Getting Started FAQ' started by Paul Cowings, Mar 11, 2023.

  1. Paul Cowings

    Paul Cowings New Member

    Hi All,

    First post, glad to become a new member. Stonemason by trade but need some advice on a digital thermostat replacement.

    Currently have an old honeywell system from 2007 and want to upgrade to a digital d90.

    However, I've got issues understanding the wiring set up. Looking on you tube etc it only shows a 2 wire set up and I have a 3 wire set up. See attached photos. 1 and 2 N and L seem a straight swap, just need to know where the 3rd wire goes into the new set up photo attached, any advice ?? Thanks 20230311_070813.jpg 20230311_071133.jpg
     
  2. Mike83

    Mike83 Screwfix Select

    Brown-A
    Blue-B
    Make the grey safe as it’s not required
     

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