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Discuss Help changing thermostat in the Central Heating Systems area at ElectrciansForums.co.uk.

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  1. Maria Shaw
    Offline

    Maria Shaw New EF Member

    Location:
    Stoke
    Hi please can you help me. My boilers thermostat wireless controller led has become unreadable so I brought a salus rt500rf to replace my honeywall BDR91. However I am lost which wires go where.
    Do I need one wire as shown in the picture.
    Thanks in advance

    30E32D6E-43B2-459F-9D0C-1B4EDAE15F4A.jpeg

    D19070A8-4442-47A1-93D3-05290EDF02A0.jpeg

    1D68D887-4019-4675-A293-636AF8FA6459.png

    463FE0A6-F916-456B-9980-580913DEECD9.jpeg
     
  2. streamer
    Offline

    streamer Regular EF Member

    Location:
    Scottish Borders
    Hi Maria.
    First of all are you confident you are able to safely isolate the supply?
    It's quite difficult to make out the wiring diagrams from the photos but I would suggest the following.
    Remove the link between L and Lin.
    Connect brown to L and blue to N on the bottom of the new stat. Connect grey to Lin and black to SL(on).
     
    • Agree Agree x 3
  3. streamer
    Offline

    streamer Regular EF Member

    Location:
    Scottish Borders
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