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

Combi boiler making hissing noise

Discussion in 'Plumbing and Central Heating' started by adamt11, 22 Jun 2020.

  1. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    A plumber came round to check a radiator that wasn't working and turned off all the radiators which fixed the issue.
    Now I'm noticing that the combi boiler and all the radiators are making a continuous whooshing sound even when turned off.
    How do I fix this? Thanks.
     
    Last edited: 22 Jun 2020
  2. Sponsored Links
  3. DP

    DP

    Joined:
    10 Dec 2003
    Messages:
    13,976
    Thanks Received:
    3,059
    Location:
    Glasgow
    Country:
    United Kingdom
    An electrician to fix your boiler is like a builder having a go to fix your brain.
    Turning off all the radiators could have a detrimental effect on the boiler if the boiler needs to circulate water through a bypass. If that bypass is a radiator which now is no longer open to allow that, pump could fail. Constant hissing could be a leak.
     
  4. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    Oh my bad I meant to say a plumber not an electrician.

    This is a video of the boiler and noise:
    https://gofile.io/d/RfJATr
    The noise seems to be coming from the pipes. The radiators in other rooms making noise as if they're on even though they're turned off.
     
    Last edited: 22 Jun 2020
  5. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    21,046
    Thanks Received:
    8,176
    Location:
    Lanarkshire
    Country:
    United Kingdom
    That sounds like your pump is running dry and needs bled
     
  6. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi, I tried doing that now but it didn't fix it.
     
  7. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
  8. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    21,046
    Thanks Received:
    8,176
    Location:
    Lanarkshire
    Country:
    United Kingdom
    how did you do it ?
     
  9. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    I undid the screw until some water came out then retightened it.
     
  10. Sponsored Links
  11. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    21,046
    Thanks Received:
    8,176
    Location:
    Lanarkshire
    Country:
    United Kingdom
    yes that is howyou do it, with the boiler running place a large screwriver against the pump and the handle end to your ear, this will tell you if it is the pump you will hear it as the sound will be amplified
     
  12. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
  13. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    4,729
    Thanks Received:
    1,043
    Country:
    United Kingdom
    Are all the radiators now turned back on?
     
  14. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    Yes.
     
  15. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    4,729
    Thanks Received:
    1,043
    Country:
    United Kingdom
    What do you mean by this?

     
  16. adamt11

    adamt11

    Joined:
    29 Sep 2015
    Messages:
    57
    Thanks Received:
    0
    Country:
    United Kingdom
    I meant the technician fixed the radiator problem initially so all the radiators work now.
    Right now they're switched off. The noise is there whether they're turned on or off.
     
  17. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    4,729
    Thanks Received:
    1,043
    Country:
    United Kingdom
    I can only suggest you get the plumber back. If the noise happens with everything switched off it is more than just air in the system.
     
Loading...

Share This Page