Vokera Compact HE pressure problem

Discussion in 'Plumbing and Central Heating' started by spoony77, 1 Oct 2019.

  1. spoony77

    spoony77

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    Hi people
    I have had a compact HE boiler for some 12 years now and all in all its been OK just a couple of issues that have been quickly sorted via engineers.
    Today when i tested the central heating for the first time since last winter it sparked up fine and heated the rads OK but the pressure gauge upon checking had shot so high that the blue indicator wasn't even visible.
    Upon seeing this I turned the heating off again via the room stat and bled my bathroom radiator of enough water to get back out of the red zone again. The boiler has since cooled and lost so much pressure that it red lighted and needed resetting.
    Now I have had the expansion vessel changed already on this boiler a couple of years back for this very problem so can it really have gone again??
    I have had a good read up here about "recharging" the vessel via a handpump and am willing to give this a try if you guys think that is what this could be and I have even had a look already to find the valve at the top and check there is no water coming out when you press the centre of the valve (there isn't - just air).
    So could this be my problem and is it worth a try should I ring a gas safe guy again?
    Any advice appreciated.
     
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  3. CBW

    CBW

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    Yes.
     
  4. ianmcd

    ianmcd

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    The expansion vessel should be checked every year at the service
     
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  5. spoony77

    spoony77

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    Ok so I checked the expansion vessel and it was reading 8 psi so I topped it up to 10 psi following the guide in the FAQ section and turned the boiler back on....after some weird gurgling noises it's working as before but the pressure guage is still rising into the red zone ....
    Anything else a keen diy-er can try before I ring the pro's??
     
  6. ianmcd

    ianmcd

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    where in the UK are you ?
     
  7. spoony77

    spoony77

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    Nottinghamshire why do you ask?
     
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  9. ianmcd

    ianmcd

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    If you say where you are there might be someone who can recommend someone in your area
     
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  10. Servotech

    Servotech

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    Have a look at the filling loop and make sure it's not got slightly opened by mistake.
    Don't forget to take the pressure off the system when pumping air into the ex vessel.
    NB You can compress air but not a liquid.
     
  11. spoony77

    spoony77

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    Thanks for the replys guys I'm wondering if the pipe to the expansion vessel is blocked as I've had a similar issue before - is this something a diy-er can get to to check? I wouldn't want to undo any pipes in the boiler that might lead to water escaping inside :/
    p.s checked filling loop is closed and made sure boiler pressure was at zero before adding air to vessel.....
     
  12. Servotech

    Servotech

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    Setting the pressure to 0 won't do much, you must have an open end whilst recharging the vessel.
    Easiest way for a DIYer to do this is take the bleed valve out of the bathroom radiator and let a 2nd person direct the flow of water into a bucket whilst you pump the expansion vessel, eventually the EV will start to re-charge.
    servotech,
     
  13. Madrab

    Madrab

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    Yes it could be.

    As suggested though, checking and recharging an EV needs to be done is a certain way too.

    I'd get someone in to do a proper service on the appliance for you and they should sort out all of that for you.
     
  14. DIYnot Local

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