Fridge not running on 12volt

Discussion in 'Fridges & Ovens' started by RobGriff, Mar 20, 2018.

  1. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    Hi my fridge will not work on 12volt only makes a buzzing noise. Runs great on 240 and gas any idea’ s please thanks Robert
     
  2. Bill_OR

    Bill_OR Funster

    Joined:
    Dec 11, 2011
    Messages:
    727
    Location:
    Nr Hastings, East Sussex
    Ratings:
    +1,475
    What sort of fridge? Mine will only run off 12v when engine is running.
     
  3. MikeD

    MikeD Funster

    Joined:
    Dec 21, 2011
    Messages:
    2,800
    Location:
    London
    Ratings:
    +2,992
    As above. 12v usually only works with the engine running
     
  4. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    Engine running and fridge will not work only a buzzing noise from fridge
     
  5. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    33,489
    Location:
    YO11 2BD
    Ratings:
    +28,905
    How do you know it's not working.
    In 12v operation there is very little heat from the vent, if any, and no noise at all.
    12v will not cool the fridge, it will only maintain a temperature already present from gas or 230v.
     
  6. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    Fridge works well on other services 240/gas but will not work on 12v when engine is running
     
  7. mitzimad

    mitzimad Funster

    Joined:
    Jan 28, 2008
    Messages:
    4,717
    Location:
    walthamstow east london
    Ratings:
    +7,345
    you need to find out if theres a 12v supply to the fridge when the engine is running if theres not it could be the relay
     
  8. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    No just a loud buzzing coming from the fridge pappajohn too noisy to travel with
     
  9. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    33,489
    Location:
    YO11 2BD
    Ratings:
    +28,905
    Time to get it checked.
    There should be no noise at all on 12v never mind noise that can be heard over the engine.
     
  10. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    Hi Steve thought it might be the relay ,going to have a look tomorrow after work . Hope you and Diane are keeping well . Rob and Deb
     
  11. RobGriff

    RobGriff Funster

    Joined:
    Aug 2, 2010
    Messages:
    157
    Location:
    TONYPANDY Rhondda Wales
    Ratings:
    +158
    Thank you pappajohn going to have a look tomorrow after work
     
  12. Spanner

    Spanner Funster

    Joined:
    Nov 7, 2015
    Messages:
    250
    Location:
    Shropshire
    Ratings:
    +237
    Can't help with the noise but when our Thetford fridge stopped working on 12 volts it was due to a bad electrical connection at the plug and socket found at the rear of the fridge at floor level in our case easily accessible from the lower vent cover, pull the connector apart and look for a burnt connection.
     
    • Nice One! Nice One! x 1
  13. mitzimad

    mitzimad Funster

    Joined:
    Jan 28, 2008
    Messages:
    4,717
    Location:
    walthamstow east london
    Ratings:
    +7,345
    actually the buzzing does point towards a relay not holding follow the buzzing noise to locate it mine is behind the fridge
     
    • Informative Informative x 1
  14. jockaneezer

    jockaneezer Funster

    Joined:
    Dec 12, 2010
    Messages:
    2,573
    Location:
    Cumbria
    Ratings:
    +8,693
    I've just recently deleted the couple of pics on my phone that I took of the 12 volt electrical connections on the rear of my Dometic and I seem to remember seeing an automotive relay in amongst it all. If that's playing up, it will make a buzzing noise. Usual reasons for it to buzz are low voltage supply to the coil or a bad connection. I've had to replace a couple of corroded Lucar connectors on mine.
     
  15. autorouter

    autorouter Funster

    Joined:
    Apr 27, 2016
    Messages:
    503
    Location:
    Manchester
    Ratings:
    +439
    There are two 12V supplies to the fridge. One is a low-current supply to power the control board. The other is a high-current supply (about 14 amps) that powers the heater element that works the cooling.

    The low-current one is on all the time. The high-current one is selected by the manual or auto selection. On most British MHs you can not run on 12 volts unless the engine is running, and this is done using a relay.

    Has this problem suddenly started after working OK for some time? I ask this because if it's always been like this, or the wiring has been changed or is incorrect, the relay could be wired wrong, so that it switches itself on and off rapidly, making a loud buzzing sound.
     
  16. Taff Thomas

    Taff Thomas Funster

    Joined:
    Apr 7, 2018
    Messages:
    39
    Location:
    Deepest Kernow
    Ratings:
    +25
    Funnily enough I have this problem on the motorhome I have just bought (second hand.) I will post more detail when I pick it up.
     
    • Nice One! Nice One! x 1
  17. Gladys

    Gladys

    Joined:
    Jul 29, 2018
    Messages:
    2
    Ratings:
    +0
    We have had our second hand Motorhome for the last 2 and a half years and the fridge has always worked fine whilst we’re travelling on 12v. But the last 2 times we switched over to 12v when setting off, the fridge has made a really bad noise. If we turn it off, the noise stops. Can’t understand why suddenly it has started this really bad noise
     
  18. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    33,489
    Location:
    YO11 2BD
    Ratings:
    +28,905
    Can you elaborate on a 'really bad noise'

    By the way, you only get 5 free posts then to continue you must subscribe.
     
  19. Gladys

    Gladys

    Joined:
    Jul 29, 2018
    Messages:
    2
    Ratings:
    +0
    Hi pappajohn

    It’s like a really high pitched screech. It doesn’t make the noise on electric or gas mode, only after we have have switched it to 12v. Pretty sure the noise starts when we start the engine when it’s in 12v mode.

    Thanks for your reply.
     
  20. Jill

    Jill Funster

    Joined:
    Jan 19, 2010
    Messages:
    192
    Location:
    Pembrokeshire
    Ratings:
    +153

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice