Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. angel While you're here, would you mind checking out our Electrician's Insurance section to see if we could save you a few quid? - Specifically our Van Insurance Deals and Public Liability Insurance Deals. Thanks for supporting the forum! angel

    5% Discount from for ALL members! - Click Here

Discuss Help changing thermostat in the Central Heating Systems area at

Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. Maria Shaw

    Maria Shaw New EF Member

    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




  2. streamer

    streamer Regular EF Member

    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

    streamer Regular EF Member

    Scottish Borders
Similar Threads - Help changing thermostat Forum Date
Wedding light up letters help! DIY Electrical Forum Yesterday at 9:14 AM
Domestic Need Help with Light Switch Change DIY Electrical Forum Wednesday at 2:15 PM

Share This Page

Electricians Directory Post a Domestic Job Post a Commercial Job