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Gas Boiler Pressure too high

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  • 27-05-2013 11:19am
    #1
    LostInDharma
    Registered Users Posts: 144 ✭✭


    Hi,

    The mains water was out in my area yesterday and when it came back the pressure in the taps was stronger than before...which is good.

    The only problem, and Im not sure if it is related , is that my Boiler pressure gauge is now reading 3 bars and the overflow release valve has kicked in and it spitting water out.

    How do I reduce the pressure back down (I thought this was a closed system and would not be affected by mains pressure increase ?)

    Any help would be great.

    Thanks.


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    #2
    aujopimur
    Registered Users Posts: 3,953 ✭✭✭aujopimur


    It would appear that an auto fillvalve has been left connected and open on your system.
    It should be removed and replaced with a filling loop, once the systen is filled it should be disconnected.
    You can reduce the pressure by draining some water thru' the drain cock, or opening the pressure relief valve.


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    #3
    LostInDharma
    Registered Users Posts: 144 ✭✭LostInDharma


    aujopimur wrote: »
    It would appear that an auto fillvalve has been left connected and open on your system.
    It should be removed and replaced with a filling loop, once the systen is filled it should be disconnected.
    You can reduce the pressure by draining some water thru' the drain cock, or opening the pressure relief valve.

    Thanks for the reply.

    auto fillvalve ? Where would that be , on the boiler ?


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    #4
    aujopimur
    Registered Users Posts: 3,953 ✭✭✭aujopimur


    Normally near the boiler or cylinder, a fill valve is usually brass with 2 valves and a gauge, which connects the heating to the mains water.


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    #5
    irishgatsu
    Registered Users Posts: 12 ✭irishgatsu


    hi,

    i have a wokera mynute 20e in the apartment and the pressure keeps going up. i've bled the rads a few times but no joy.
    looking at other tread/photos seems like the valves controlling the pressure should be in my hot press. i just can't find which valve i should close in there as there's also a pump (for extra pressure).
    below pics from my hot press:
    https://www.dropbox.com/sc/opozzh60mkbmnx4/6qem1lQJAu
    https://www.dropbox.com/sc/dip40h168f7x0fi/6RFFOPQbUT

    thanks to all in advance for your help!


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    #6
    JohnnieK
    Registered Users Posts: 2,526 ✭✭✭JohnnieK


    irishgatsu wrote: »
    hi,

    i have a wokera mynute 20e in the apartment and the pressure keeps going up. i've bled the rads a few times but no joy.
    looking at other tread/photos seems like the valves controlling the pressure should be in my hot press. i just can't find which valve i should close in there as there's also a pump (for extra pressure).
    below pics from my hot press:
    https://www.dropbox.com/sc/opozzh60mkbmnx4/6qem1lQJAu
    https://www.dropbox.com/sc/dip40h168f7x0fi/6RFFOPQbUT

    thanks to all in advance for your help!

    You have an auto fill valve too. It's in the second picture at the top just under the shelf. You need to check the pressure when the system is cold. If it is around 2.5/3.0bar then I would suspect the auto filler is faulty and is allowing the full pressure in. Please get this replaced with a proper filling loop as they are a total piece of sh#t.

    If the pressure is around 1.5bar then I would be looking at the expansion vessel in the boiler.


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