Boiler fog horn when running a bath

Discussion in 'Plumbers' Talk' started by Chris Bell 9, Dec 2, 2019.

  1. Chris Bell 9

    Chris Bell 9 New Member

    We have a combo boiler and the last few weeks when running a bath the boiler has started to make an intermittent fog horn like revving sound. It doesn’t happen when the heating is on or when using sink taps. I went to the boiler when it happens and the flame icon disappears, it makes the noise for a few seconds and then seems like it fires up again. Any clues as to what’s happening?

  2. kiaora

    kiaora Screwfix Select

    it is possible the main heat exchanger is blocked.
    the water is slowing down as it passes through, and boils as it passes. can be similar to a kettle boiling noise
  3. Chris Bell 9

    Chris Bell 9 New Member

    thanks, we'll get someone out to take a look.

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