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baxi duotec combi 24he boiler, loud high pitched humming, whining noise.

Discussion in 'Plumbing and Central Heating' started by jon ccc, 30 Nov 2015.

  1. jon ccc

    jon ccc

    Joined:
    10 Nov 2015
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    Country:
    United Kingdom
    Hello
    I have an 8yo old baxi duotec combi 24he boiler.
    When the gas central heating is running, it makes a constant loud high pitched humming/whinning noise.
    The tone lowers for about 5 seconds, each time the boiler reignites to heat the radiator water. Before then returning to the same level.


    I am in the room above the boiler, the noise is quite loud and its persistence gives me ringing ears.
    [see the link to hear the noise, recorded upstairs. the recording does not capture how loud the note is, only its tone ].
    https://drive.google.com/file/d/0B2It1xwGdQ1IX012T1FXYVJLb1E/view?usp=sharing


    Further info,
    If the central heating is off, but the hot water tap is turned on. The boiler makes the same sound but at a much quieter level.


    the diverter valve?* was replaced last week, but the noise is still there.
    *Im sure the engineer said he replaced the diverter valve, after I also said that when the hot water tap is turned on for over five minutes, the radiators would fill with warm water.


    --
    My questions:
    1. What is the noise likely to be coming from in the boiler? [or where has similar noise come from in other related boilers]
    2. And when I call out the baxi engineer again, to attempt to identify the noise source. What are the likely parts, where they should first start their fault finding?


    Thanks
    Jon
     
    Last edited: 1 Dec 2015
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