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Expansion vessel problem

Discussion in 'Plumbing and Central Heating' started by 5oysterman2, 14 Oct 2020.

  1. 5oysterman2

    5oysterman2

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    Afternoon guy's. Before i contact anyone to come round & fix the problem, I would like to run it past you guys. Got a vaillant ecoTEC plus 831(in loft). It's about 13 years old. Lost pressure on Sunday i refilled it but overnight it done it again & this time i noticed water had come out of the copper pipe at the side of the house.
    After googling problem, I checked expansion vessel & water came out. This i have read means it needs replacing. Also read after PRV operates, it might not work properly again. Would i be wise to have that replaced at the same time?
    Does it sound like the issue or could it be anything else?

    Another thing i noticed today when I had to refill it. I got my wife to run hot tap in kitchen & the pressure gauge on boiler jumped from about 11 o'clock position (grey) to 2 o'clock position (red) Not noticed this happening before, could i have more problems.
    Sorry for rambling on a bit. Regards Doug
     
  2. terryplumb

    terryplumb

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    The EV likely needs replacing ,but may just need re charging.
    The PRV , once it has lifted can sometimes not fully re seat, needs checking out.
    If your boiler pressure reaches around 3 bar when heating ,the prv will lift to release pressure ,as the EV is not accommodating the expansion.
     
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  4. 5oysterman2

    5oysterman2

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    Cheers for the reply terryplumb. I assumed if water was coming out of the EV via the valve connection, it couldn't be recharged. Have i got that right
     
  5. 45yearsagasman

    45yearsagasman

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    If there's water from the connection used to pump up the vessel, it means the diaphragm is punctured, and the whole vessel needs replacing. You could leave it in situ and fit a new external EV on the return pipe close to the boiler if space permits.
     
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