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Baxi main combi 24 HE leaking diverter valve housing

Discussion in 'Plumbing and Central Heating' started by ash1212002, 23 Dec 2019.

  1. ash1212002

    ash1212002

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    Baxi main combi 24 HE

    the diverter valve was replaced within the brass housing a few months ago, there are 2 grub screws one at the top and one at the bottom that holds the diverter valve in place to the rest of the assembly

    However there appears to be water leaking out of a hole which is next to the grub screw

    any ideas what would be causing this?
     

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  3. ianmcd

    ianmcd

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    there is a very small O ring between the diaphragm housing and the diverter valve, no need to drain the boiler , isolate the cold water inlet, open a hot tap, remove the two small pipes , undo the two screws and it will lift out look on the back and you will see the small O ring
     
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  4. ash1212002

    ash1212002

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    Hi Ian,

    The small O ring was replaced, I have uploaded a pic where I have indicated where the water is leaking out from
     
  5. ianmcd

    ianmcd

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    well it is possible to leak from the front end piece of the diverter valve but unusual it is nearly always the tiny O ring, an easy test , isolate the cold water supply and open a hot tap and leave it open, if leak stops it is the O ring if it doesnt it is the front end piece sometimes called the tailplate, but if a new diverter valve would be surprised
     
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  6. ash1212002

    ash1212002

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    When I inserted the new O ring in I ensured it was clean, fully seated in place and also applied some grease, so surprised it could be leaking from there

    I will test and report back, if it continues to leak will i need to replace the front end which i believe the part is a pressure differential assembly?
     
    Last edited: 23 Dec 2019
  7. ianmcd

    ianmcd

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    you also have to remove the diaphragm end and clean the pushrod with steel wool and grease that too, as aid an easy test by just turning off the water and opening a tap, if it is coming from the other side you will be losing system pressure
     
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  8. ash1212002

    ash1212002

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    The pressure seems to be fine, so I suspect it's the small O ring, shall i buy a new one or disassemble clean and try again?
     
  9. ianmcd

    ianmcd

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    usually the old one is flat more like a washer when you remove it and the new one is like a doughnut, it gets compressed when everything is tightened up, it isnt a big job to remove and have a look and see if you have done something wrong, if you need a new O ring you can buy it as a Biasi part about £3 no need to buy the complete service kit
     
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  11. ash1212002

    ash1212002

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    Hi Ian

    Upon further inspection the boiler is losing pressure gradually, in this case what do I need to replace?
     
  12. ianmcd

    ianmcd

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    This bit, I know this one is for a Vokera it is just to show you which part it is they use the same diverter, thought you said it was a new diverter valve so it shouldnt be leaking?
    https://www.ebay.co.uk/itm/Vokera-Maxin-24E-28E-Boiler-3-Port-Diverter-Valve-Tail-Plate-Bush-0862-R0862/332579533485?epid=1523081054&_trkparms=ispr=1&hash=item4d6f48f2ad:g:1loAAOSwo4pYExvp&enc=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&checksum=332579533485769834aab4534e9da7c75dfb993a094a&enc=AQAEAAACUBPxNw+Vj6nta7CKEs3N0qX6rqF1xtJDDQOXdX/eaWLyTMI2LKdd5NG/fI8ch+n8TgVw7MkWHPi4Oq9sXDD4njIyZiOfYxO4kw0eA+TS9DO+74SJT1nKOd4rSA+TQx8+hOkEg7TCS+f+MaH0dyWNhoqLS91aYOK8vuH9mo1S45Xr+FmtPszYAAQpJ+aU7Z+PTHG/UcmvCpcA69XxezeMh2WDG0zTsXGF7Adf5jIOhk5BcY0OUB3f3boJAtFKNwUVKce6Sb349ml0cJtWMLpp5lRWlryPn0h087+tray0hWJ6HuZVqRuhRbzK1xlRrYoYEzQ6pIVWvTF/Zwt0EtP9GUbaT+kVmT/FmqPMYRCf+Els3pzWkStPBd5LWPSRGWdjCle7vl8nSblD+L3jz9TvI19zo2YqcEgYq3QcFQBrRpRQz4b+oejelWPEceR6o20XviJVZmzRgjYWKEYAW1BOjU/MLRLEu8n/km4A/8pNGZH1WuRZkQ+BZVXc6ggNE64e3yYTst78NiKfLwotJAZfhM4dg/f79/RyBH5jO70qsjvdg/JMzOpkkeZG7Zd3iv+X8PdBKp09RAO5lVagD12u5PYCQNmX0afYWnLXqcKAE1iaaThePlMkXpHW9BRdVj2+1XfN2R2B+Mpql18GNKuK9uSSeAjYwHwsGSEIRRDLN6XlDCo2GZSEpXdK1g53/QirL3IhFGDx03PqejRwfIR2uNrBVxEEhDLtOawZjZwGcLY7zi54WYBzjM3ptAbY95Q+7apZuLLsmG3mwnOHPMkodvE=&checksum=332579533485769834aab4534e9da7c75dfb993a094a
     
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  13. ash1212002

    ash1212002

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    Hi Ian,

    I may have got the terminology wrong, this is what i purchased at the time

    https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/273214571641

    Having fitted this kit, there is a leak coming from that hole I circled in red in my first post.

    It was fine for a few months but now has started to leak from there
     
  14. ianmcd

    ianmcd

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  15. ash1212002

    ash1212002

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    Ah ok, should I buy the complete kit? Or just that part you mentioned earlier?

    https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/352694227991
     
  16. ianmcd

    ianmcd

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    just buy the tail plate and make sure you clean and grease the thrust pin
     
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  17. ash1212002

    ash1212002

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    Sure will do, do I need to drain the boiler to fit this part?
     
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