hissing in radiators

Discussion in 'Plumbing and Central Heating' started by DrGonzo, 12 Oct 2012.

  1. DrGonzo

    DrGonzo

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    A few of the radiators around the house have a hissing sound/air sound in them. I turned a few down to 3 instead of 5 and that seems to stop it but sometimes it come back.

    None of them are cold at the top, which would normally mean they needed bleeding so I am not sure what this is.

    Sometimes the noise changes pitch but not that often.

    Any ideas what I can do to solve this?
     
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  3. Armo74

    Armo74

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    Are the TRV's on the flow or return?
     
  4. DrGonzo

    DrGonzo

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    they are on the left hand side of the radiators as you look at it
     
  5. Diyisfun

    Diyisfun

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    lol..that was funnny.

    left or right wont help.
    Feel the pipe what end gets hot 1st is the flow
     
  6. HERTS P&D

    HERTS P&D

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    If yours is on an open vent system, then turn your pump speed down.

    Andy
     
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  8. DrGonzo

    DrGonzo

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    It's a Vaillant ecotec plus.
    How can you turn the pump speed down? I turned the temp down but didn;t seem to do much.
     
  9. doitall

    doitall

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    Re-pipe the system with larger pipes.

    Fit or adjust the auto by-pass.

    Turn the lockshield valve off on the problem rads.

    All the above.
     
  10. DrGonzo

    DrGonzo

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    Landlord won't pay for any of that if there's a cheaper solution like turning the pump speed down but I don;t know how to do it.
    All the rds make the sound so if the valve is turned off on all of them then they won't work?
     
  11. DrGonzo

    DrGonzo

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    It's a Vaillant ecotec plus.
    How can you turn the pump speed down? I turned the temp down but didn;t seem to do much.
     
  12. DIYnot Local

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