Vaillant boiler high pitch sound /whistle

Discussion in 'Plumbing and Central Heating' started by Mrspine, 31 Jan 2021.

  1. Mrspine

    Mrspine

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    My Vaillant Main Combi 25 Eco - is making a very loud whistle sound / high pitch whine.

    - if I switch off the boiler while its whistling the sound still continues for a few seconds before winding down (sometimes it drops in pitch gradually)

    - the sound is just as loud outside at the flue vent

    - it can come in and out while the boiler is on

    Noone seems to know how to tackle this. Its really driving us crazy.
     
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  3. Jajodu

    Jajodu

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    Sounds like the fan, does it only occur when the burner is going? Does it stop when the burner exstinguishes, if not it may be the pump.
     
  4. Agile-Services

    Agile-Services

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    There are also sometimes gas combustion problems which can cause this effect.

    For that reason I would always advise a competent gas registered engineer is called to diagnose.

    It can also sometimes caused by a heat exchanger which is seriously scaled up.
     
  5. DIYnot Local

    DIYnot Local

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