Ariston Microgenus 23 combi boiler

Discussion in 'UK DIY' started by Lawrence Raybould, Jan 6, 2004.

  1. Ariston Microgenus 23 combi boiler

    My boiler recently developed a fault where I had central heating but
    no domestic hot water (stone cold). I was advised to fit a new
    diverter valve which I did.

    The problem I have now is that I still have central heating but the
    domestic hot water only runs hot for 2 to 3 minutes then runs luke
    warm although the boiler is still fired up.

    Does anyone have any suggestions what is causing this to happen?
    Lawrence Raybould, Jan 6, 2004
    #1
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  2. Lawrence Raybould

    BillR Guest

    Lawrence Raybould wrote:
    > Ariston Microgenus 23 combi boiler
    >
    > My boiler recently developed a fault where I had central heating but
    > no domestic hot water (stone cold). I was advised to fit a new
    > diverter valve which I did.
    >
    > The problem I have now is that I still have central heating but the
    > domestic hot water only runs hot for 2 to 3 minutes then runs luke
    > warm although the boiler is still fired up.
    >
    > Does anyone have any suggestions what is causing this to happen?


    Flow switch?
    BillR, Jan 6, 2004
    #2
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  3. Lawrence Raybould

    Ed Sirett Guest

    On Tue, 06 Jan 2004 12:20:57 +0000, Lawrence Raybould wrote:

    > Ariston Microgenus 23 combi boiler
    >
    > My boiler recently developed a fault where I had central heating but
    > no domestic hot water (stone cold). I was advised to fit a new
    > diverter valve which I did.
    >
    > The problem I have now is that I still have central heating but the
    > domestic hot water only runs hot for 2 to 3 minutes then runs luke
    > warm although the boiler is still fired up.
    >
    > Does anyone have any suggestions what is causing this to happen?


    1) Temperature sensor(s) out of spec?
    2) Diverter valve letting primary water to CH during DHW mode.

    I'm fairly sure this boiler does not have any sort of thermal store but
    otherwise the behaviour is exactly as it would be if it had.

    --
    Ed Sirett - Property maintainer and registered gas fitter.
    The FAQ for uk.diy is at www.diyfaq.org.uk
    Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
    Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
    Ed Sirett, Jan 6, 2004
    #3
  4. Lawrence Raybould

    IMM Guest

    "Ed Sirett" <> wrote in message
    news:p...
    > On Tue, 06 Jan 2004 12:20:57 +0000, Lawrence Raybould wrote:
    >
    > > Ariston Microgenus 23 combi boiler
    > >
    > > My boiler recently developed a fault where I had central heating but
    > > no domestic hot water (stone cold). I was advised to fit a new
    > > diverter valve which I did.
    > >
    > > The problem I have now is that I still have central heating but the
    > > domestic hot water only runs hot for 2 to 3 minutes then runs luke
    > > warm although the boiler is still fired up.
    > >
    > > Does anyone have any suggestions what is causing this to happen?

    >
    > 1) Temperature sensor(s) out of spec?
    > 2) Diverter valve letting primary water to CH during DHW mode.
    >
    > I'm fairly sure this boiler does not have any sort of thermal store but
    > otherwise the behaviour is exactly as it would be if it had.


    It has an electric diverter valve. It has a flow switch which detects flow
    and energises the diverter valve. Had the valve actually gone? The
    actuator can be changed, rather than the whole valve inc water section.



    ---
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    IMM, Jan 7, 2004
    #4
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