Noisy radiators (very strange as only three)

Discussion in 'Plumbers' Talk' started by martin88, Jan 1, 2020.

  1. martin88

    martin88 New Member

    Hi All,

    I have recently had a new Combi boiler installed - ideal logic 30KW

    I’m having issues with three rads (landing, back bedroom and front bedroom) every other one is fine and we have a total of 3 towel rads, 4 doubles and 5 singles in our house

    when the heating is on I can hear like a water / boiler noise from these rads, even when the heating is off and we use the hot water we hear the same noise.

    I have tried the following to resolve the issue

    1. bleed all rads so no ai
    2. Turn pump speed down to 70% as this is lowest it can go
    3. Drain the system and re fill and bleed
    4. Remove TVR heads to see if any issue
    5. Turn down lock shield heads to restrict the flow of water
    6. All rads and tvr, are less than 2 years old

    if anyone can shed some light it would be great and it’s driving me mad!


  2. Teki

    Teki Active Member

    Do all the radiators that you are having issues with happen to be on the same floor?

    Can you try turning off the TRV/valve on all the other radiators and see if the ones you were having an issue with still make the noise? Leave those running for a short while and then bleed those radiators.
  3. martin88

    martin88 New Member


    yes they are on the same floor

    I will turn the other two rads that are on that floor and run the heating.. do I then bleed the rads that are left on?

  4. heatyman

    heatyman Well-Known Member

    As I replied on the other forum, bleed these rads through both the flow AND return.
  5. martin88

    martin88 New Member

    How do you do that heatyman
  6. martin88

    martin88 New Member

    I have just completed that and also turned off all bar one rad upstairs, a little bit of air came out but still making the noise.
  7. Mike83

    Mike83 Screwfix Select

    Sometimes opening up the lockshields on the rads in question can help.
    It can effect the balancing a bit but worth a try.
  8. martin88

    martin88 New Member

    hi mike,

    I’ve tried that too, still no improvement
  9. Teki

    Teki Active Member

    Did you also turn off all the other radiators in the house?
  10. martin88

    martin88 New Member

    no just upstairs mate
  11. Teki

    Teki Active Member

    You need to turn off all radiators in the house except each of the ones making a noise in turn and vent those after running them for a while individually.

    Also note if the noise is still there when you do that.
    The Teach likes this.
  12. martin88

    martin88 New Member

    Ok I will try this tomorrow.

    If this doesn’t sort it, what else can I try?
  13. Astramax

    Astramax Screwfix Select

    Best do what Teki has suggested first. ;) may not have to try anything else.:)
    Teki likes this.
  14. martin88

    martin88 New Member

    evening all,

    I have tried this tonight as well as bleeding the rads in questions by shutting flow and return valves and no air came out, I’m 100% certain there is no air in the pipework, I’m
    Thinking it’s the boiler noise travelling through the pipework.
  15. The Teach

    The Teach Screwfix Select

    well its been established there is no air currently in the affected radiators,it's a process of elimination;)

    maybe adjust the external bypass,ie let it pass more water ;)
  16. martin88

    martin88 New Member

    Hi Teach,

    how do I do that?
  17. The Teach

    The Teach Screwfix Select

    locate the external bypass valve,it will have + & - settings or just numbers,hopefully there is an auto bypass valve fitted ;)
  18. martin88

    martin88 New Member

    Where is this though?
  19. Astramax

    Astramax Screwfix Select

    That's good as that's another one to tick off the list.................get the fitter back to check out the installation would be a good move.
  20. martin88

    martin88 New Member

    as I said I think I’ve got a issue with my pipework rather than the install, so going to get that looked at I think.

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