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Boiler loses pressure

  • 30-04-2016 7:27pm
    #1
    zagmund
    Registered Users, Registered Users 2 Posts: 2,501 ✭✭✭


    Can anyone shed some light on this for me please?

    We have a Vitodens 100-W condensing boiler. Only one of the two circuits is plumbed in, the other one is capped off. There's a small leak from the capped circuit . . . a drip every few minutes. I have a container catching the water and over the course of a week it might lose a litre or so. I plan on getting the plumber back to cap it properly to address the drip.

    The problem I'm seeing though is that every 7-10 days the pressure in the system drops to 0. When I see this I open the valve and bring the pressure back up to 1.5 or 2 or thereabouts and all is well again.

    I've been keeping an eye on it for a while now and it's definitely not going down bit by bit by bit (because of the dripping leak) until it gets to 0. It will be at normal pressure for a week or more and then suddenly drop to 0. The boiler is on every day for a couple of hours on the same schedule, so there doesn't seem to be anything different about the days when it loses pressure.

    I'll ask the plumber when he's fixing the drip and I reckon the two issues are most likely related but I thought I would check in here first to see what else might be accounting for this sudden drop rather than a gradual drop.

    Any ideas what's causing it?

    z


Comments

  • #2
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,383 Mod ✭✭✭✭Wearb


    Perhaps the needle sticking a bit on the gauge. Fixing the leak will most likely sort it. Maybe change the gauge at the same time.

    Please follow site and charter rules. "Resistance is futile"



  • #3
    jca
    Closed Accounts Posts: 8,585 ✭✭✭jca


    It could be that the gauge shows pressure until the pressure vessel empties of water and then it falls to zero.


  • #4
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    I've been keeping an eye on it for a while now and it's definitely not going down bit by bit by bit (because of the dripping leak) until it gets to 0. It will be at normal pressure for a week or more and then suddenly drop to 0. The boiler is on every day for a couple of hours on the same schedule, so there doesn't seem to be anything different about the days when it loses pressure.

    But the circuit not in use is not always 'open' to the system pressure, as there is a diverter valve, and as this valve cycles open, it may take a gulp of the system water.

    1ts course of action would be have the leak sorted, then see.


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