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Discuss Just installed a new boiler, there are banging or knocking noise from the radiator. in the Central Heating Forum area at UKPlumbersForums.co.uk.

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  1. cidfenmaria

    cidfenmaria Member

    Just replaced a new boiler. when the heating is on I can always hear banging or knocking noise from the radiator and sounds like machine gun. never happen with the old boiler. someone said that it's the radiator valve that's causing the problem & need replacing. just incase I'd waste money if that's not true can someone give suggestion for diagnoses.

    Thanks
     
  2. scott_d

    scott_d Plumber GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    Have you contacted the installer or did you fit the boiler yourself?
     
  3. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    thanks for reply not a plumber myself. someone qualified fitted that for me and that's what he says. I had a feeling that it's not about the valve plus the valve were only fitted 3 yrs ago still considered pretty new. cheers
     
  4. Riley

    Riley Plumber GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    Has it been doing it since the boiler was fitted or has it only just started
     
  5. scott_d

    scott_d Plumber GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    If you shut the thermostatic valve head down does it stop?
     
  6. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    since it's fitted.
     
  7. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    yes! it stops after I adjust the thermostatic valve (up or down). but after a while it comes up again. So I had to repeat it through each individual ones located upstair/downstair like playing a whac-a-mole game.

    Also I notice that turning the hot tap on will stop the sound as well.

    any clues?
     
  8. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    I haven't try shutting the thermostatic valve down completely though
     
  9. gassafe

    gassafe Plumber GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    Flow is going through the wrong way... Maybe the plumber swopped flow & return...

    Bi-directional trv should solve it
     
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  10. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    thanks it's helpful. do you mean the plumber swop the in/out water pipe somehow?. or it's the new boiler that makes the difference. have to replace all valva to Bi-directional trv? thanks
     
  11. Gasmk1

    Gasmk1 GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    the TRV should be bi directional if it is not then the TRV will ned changing not the pipes. it stops when you run hot water because it is a combi and the pumps is now doing the hot water not the heating.
     
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  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    could be air trapped in the system
     
  13. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    Thanks for replies above does it make sense to swop the water pipe to keep the existing trv?
     
  14. scott_d

    scott_d Plumber GSR

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    No, the others might start banging
     
  15. Jay The Plumber

    Jay The Plumber Active Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    have a look on the side of the TRV on the problem rad, if it has a single arrow indication flow on the side of it, thats the direction that the water should be flowing in.
    check the temperature of the 2 pipes going to the rad, if the TRV pipe is a lower temp than the other one, change the TRV on that rad to a Bi directional.
     
  16. Nuttyboy

    Nuttyboy New Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    Sounds like combi boiler and installer has swapped flow and return around,,trv is now juddering with reverse flow
     
  17. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    ohh really. currently all rads are banging. that's what the installer suggest. though worth having a go.
     
  18. cidfenmaria

    cidfenmaria Member

    Re: Just installed a new boiler, there are banging or knocking noise from the radiato

    will take a look
     
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