Boiler fog horn when running a bath

Discussion in 'Plumbers' Talk' started by Chris Bell 9, Dec 2, 2019 at 9:24 PM.

  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 Well-Known Member

    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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