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Sime super 90 making high pitched humming, whining noise

Discussion in 'Plumbing and Central Heating' started by Zehroni, 27 Nov 2016.

  1. Zehroni

    Zehroni

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    Sime super 90 making high pitched humming, whining noise when there is a demand for DHW. as soon we open the hot water tap the noise get louder and louder. it does not do that when the CH on. the pressure is 1 bar.
     
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  3. Agile

    Agile

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    Does it make the noise if the electricity supply to boiler is turned off?
     
  4. Zehroni

    Zehroni

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    no it does not. it only make the noise when there is a demand for DHW
     
  5. Agile

    Agile

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    Let me ask the same question another way!

    If you turn off the power to the boiler, then create a demand for hot water by turning on a hot tap, does the boiler make that noise?

    Tony
     
  6. Zehroni

    Zehroni

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    no it does not. it only make the normal noise of water running in a pipe. but the noise I talking about start as low then increases fast as the modulator works due to DHW demand
     
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  8. Agile

    Agile

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    That is not clear.

    When is it loudest?
     
  9. Zehroni

    Zehroni

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    Here is what happens in sequence

    1. open that tap

    2. hearing constant noise from water running through the pipe. This noise stays at the same level whether the boiler is switched on or off.

    3. When the boiler is switched on. the below happens in sequence:-

    a. The fan starts

    b. Pump starts

    c. Ignition starts

    d. The boiler fires up; at this stage the noise start but low

    e. Modulator kicks off the noise gets louder and louder within few seconds and stays loud as long as there is a diamond for DHW

    4. Trun off the tap, the noise stops
     
  10. Agile

    Agile

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    You probably need a gas registered engineer to check the gas settings on your boiler.

    The pump would normally start before the fan.

    Tony
     
    Last edited: 2 Dec 2016
  11. ianmcd

    ianmcd

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    post a video of it happening and we might be better equipped to advise you
     
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