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Horrible vibration noise as toilet cistern refills.

  • 29-08-2015 9:15pm
    #1
    osarusan
    Registered Users, Registered Users 2 Posts: 16,734 ✭✭✭✭


    As the thread title says, one of the toilets makes a horrible noise when it is refilling after a flush. It sounds like somebody drilling a hole in the wall.

    I have lifted the lid and the noise seems to be coming from the perpendicular plastic pipe/thing to which the ballcock is attached. It is visibly vibrating. If I force the ballcock all the way down, the water will gush out rather than dribble, and it will stop the vibration.

    It is connected to a pumped cistern - not one just supplying water through gravity. I would guess this a big part of the issue, but would love to hear from others who might be able to shed some light on it and offer advice.


Comments

  • #2
    Robbie.G
    Registered Users, Registered Users 2 Posts: 1,884 ✭✭✭Robbie.G


    osarusan wrote: »
    As the thread title says, one of the toilets makes a horrible noise when it is refilling after a flush. It sounds like somebody drilling a hole in the wall.

    I have lifted the lid and the noise seems to be coming from the perpendicular plastic pipe/thing to which the ballcock is attached. It is visibly vibrating. If I force the ballcock all the way down, the water will gush out rather than dribble, and it will stop the vibration.

    It is connected to a pumped cistern - not one just supplying water through gravity. I would guess this a big part of the issue, but would love to hear from others who might be able to shed some light on it and offer advice.

    It's what is called water hammer and it's due to high pressure of water
    Is the water from taps very high pressure
    Possible problem with water booster pump
    possible blockage in ball valve slowing water down
    Possible
    Worn ball valve


  • #3
    nmacc
    Registered Users, Registered Users 2 Posts: 459 ✭✭nmacc


    It's definitely water hammer, but it's unlikely to be excess pressure, as I'm presuming it's worked up till now.

    Your first step is to change the washer in the cistern ballcock. It's a necessary step, but it often doesn't fix it. Next step is to change the washer in the ballcock in the cold water storage tank in the loft. Sometimes the ballcock in the loft bounces and the water transfers the noise to the only open fitting - the toilet.

    If that doesn't fix it you may need a paddle on the float or an air chamber at the ballcock made up from a short length of capped pipe. It's not a difficult job, but change the washers first.


  • #4
    osarusan
    Registered Users, Registered Users 2 Posts: 16,734 ✭✭✭✭osarusan


    Thanks for your replies. It definitely seems like you know what the problem is.

    Actually it has been noisy since we first moved in, but the noise has got worse recently. The water tank is not in the loft, it's on the same level as the second floor showers and toilets, and that is why it is a pumped water tank rather than just using gravity to fill up the text.

    In the taps or shower, the water will be pretty weak at first, and then when the pump kicks in, the water comes out with a fairly high amount of pressure.


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