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Boiler making a hissing noise and pressure going up rapidly.

Discussion in 'Plumbing and Central Heating' started by patryk991, 7 Dec 2018.

  1. patryk991

    patryk991

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    Hi,

    I have an issue with my boiler which consists of it making a hissing noise and pressure meter going up when the central heating is on.

    I haven't tested what happens when the pressure is extremely high as I turn it off before it goes above 3 bars.

    The central heating is not working but hot water is. Thing about hot water is that when I turned the tap on today I had rusty water come out and then steam for some time, this has stopped now and hot water seems to work properly.

    Additionally, the last couple of time I had central heating on I could hear loud banging of the pipes a couple of times, not often.
     
  2. ianmcd

    ianmcd

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    sounds like your expansion vessel needs re-pressurizing lots of explanations of how to do it in the FAQ section
     
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  3. patryk991

    patryk991

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    I'll have a look thanks.
     
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  4. patryk991

    patryk991

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    If in fact it is a problem with the expansion vessel then would it be safe to use hot water at least?
     
    Last edited: 7 Dec 2018
  5. ianmcd

    ianmcd

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    if it is a combi then yes
     
  6. patryk991

    patryk991

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  7. ianmcd

    ianmcd

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    yes the swift flow is a combi, but a very old one, I wouldnt be spending a lot of money on that to be honest
     
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