1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Radiators randomly came on and wont turn off.

Discussion in 'Plumbing and Central Heating' started by j4g3d, 25 Jul 2020.

  1. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi guys,
    Thermostat is in the OFF position but the boiler is on and the radiators are piping hot.

    If i turn the hot water on the boilers light turns on for the RADS but lights up as it should for the HW. If i turn the HW off, the light for HW turns off, as it should but, the radiator light is ON again. Eeek.

    Whats going on here? internal fault in the boiler?
     
  2. Sponsored Links
  3. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    6,015
    Thanks Received:
    1,248
    Country:
    United Kingdom
    Make and model of the boiler would be helpful.
     
  4. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
    It would, wouldn't it lol.
    BAXI COMI 28 HE

    Although googling that model shows one that appears to be different. Mine looks like this:

    http://www.home-boilers.co.uk/Baxi-Duo-Tec-28.html
     
  5. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,816
    Thanks Received:
    9,222
    Location:
    Lanarkshire
    Country:
    United Kingdom
    Post a pic of your thermostat so we can see what you have
     
  6. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
  7. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,237
    Thanks Received:
    3,035
    Location:
    Daventry
    Country:
    United Kingdom
    What happens if you move the slider on the programmer from "CONT" to "OFF"?
     
    • Like Like x 1
  8. Sponsored Links
  9. picasso

    picasso

    Joined:
    8 Apr 2008
    Messages:
    10,599
    Thanks Received:
    2,652
    Location:
    Essex
    Country:
    United Kingdom
    Might be Frost protection kicking in which means main thermistor fault, if you turn selector dial to summer mode and boiler stops then frost protection most likely fault.
     
  10. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
    If I do that then the hot water is back. Radiators aren't on BUT.. if i then turn the thermostat ON, the radiators still don't come on..

    What do you think? Faulty thermostat? it doesn't actually feel right when i turn the dial, normally it clicks when you turn it on but now it just click like a button.. its odd, definitely doesn't feel right.
     
  11. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
    Which ones summer mode bud? I normally keep it on CONT.
     
  12. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,237
    Thanks Received:
    3,035
    Location:
    Daventry
    Country:
    United Kingdom
    Yep, sounds like a faulty thermostat to me. Worth testing with a multimeter before replacing though
     
  13. j4g3d

    j4g3d

    Joined:
    16 Feb 2014
    Messages:
    44
    Thanks Received:
    0
    Country:
    United Kingdom
    Thermostat replaced and all working again. Thanks (y)
     
  14. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page