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Discuss Baxi 105e pressure problem in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. quietman

    quietman New Member

    Hi guys/gals, my Baxi runs fine if cold set pressure is no more than 0.5bar, pressure increase when hot 1.5bar. If I try to increase the cold pressure to 0.7bar then the hot pressure reaches 3bar and the pressure relief valve drips the excess pressure away. When this happens and the boiler returns to cold the cold pressure is back to 0.5 bar and the boiler runs perfectly well.
    So, I guess it's either the expansion vessel pressure needs topping up (boiler is approx 13yrs old) or the vessel has failed and needs changing. Any guesses as to which I'll find tomorrow when I press the shraeder valve?
    Thanks for your help/comments.
    Ps. Does a replacement vessel come pre-charged?
     
  2. mrStat

    mrStat New Member

    Hi, yes a replacement vessel comes pre-charged. 50:50 as to whether or not it has totally failed. Just remember step to the side when you press that schraeder valve for when that water squirts out.
     
  3. Riley

    Riley Plumber GSR Top Contributor!!

    But you will require a gas safe engineer to fit it to your boiler as you should not be removing the cover legally as this can form a combustion seal that you have no way of testing if it’s refitted properly
     
  4. mrStat

    mrStat New Member

    If it’s a standard efficiency 105e then the vessel is at the rear and won’t need access to the chamber. ;)

    Just remember. Don’t disturb the flue
     
    • Like Like x 1
  5. Riley

    Riley Plumber GSR Top Contributor!!

    So again a gas safe engineer is probably the way to go
     
    • Agree Agree x 1
  6. quietman

    quietman New Member

    Thank you guys for your comments. Fingers crossed that it's a top up required, the 0.5bar pressure when cold gives me a little hope although the replacement procedure doesn't look to much of a problem! I should have mentioned I am a City and Guilds trained Plumber and although I've been out of the trade for about 30yrs I've tried to keep abreast of the changes that have occurred. I believe, and I'm sure you'll correct me if I'm wrong, that the legislation requires a "competent person" in these circumstances so I would hope that I would qualify, after all I do have my own "U" gauge!
     
  7. Riley

    Riley Plumber GSR Top Contributor!!

    If you have to remove the flue you have no analyser to test its reassembly. I’m not being awkward if you need a new vessel fit an external one
     
    • Agree Agree x 1
  8. quietman

    quietman New Member

    Riley, you're not being awkward at all, I appreciate any advice. I've never fitted an external expansion vessel, if you have any suggestions regarding make I'd be happy to hear them. I believe it would be added like another rad to the system, I could site it next to the boiler. I think the current vessel is either 8ltr or 10ltr. Any input gratefully received. Cheers.
     
  9. Riley

    Riley Plumber GSR Top Contributor!!

    Just needs to be of a suitable size cut into the return pipework
     
  10. Riley

    Riley Plumber GSR Top Contributor!!

    I’d go to an independent merchant
     
  11. quietman

    quietman New Member

    I normally use my local Plumb Center. I thought the expansion vessel had to have a connection to both the flow and return?
     
  12. Riley

    Riley Plumber GSR Top Contributor!!

    It does, the boiler
     
  13. quietman

    quietman New Member

    Fair enough, I'm getting old but not too old to learn, it's just that the onboard vessel has a two pipe connection but as you say the system pressure is equal across the circuit. Thank you for your help.
     
  14. Riley

    Riley Plumber GSR Top Contributor!!

    Pleasure mate. We’re happy to help as long as no diy on gas appliances
     
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Normally fit them on the return but doesn't really matter
     
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