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2015 TT Prestige boiler over-pressurizing and dumping water

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HeatingHelp
HeatingHelp Administrator Posts: 715
in THE MAIN WALL
This discussion was created from comments split from: Triangle Tube Prestige Solo and Excellence Boilers.

Comments

  • GPG77
    GPG77 Member Posts: 5

    I have a 2015 TT Prestige boiler. It is over-pressurizing and dumping water. It also has had a lot of air in the system. When I shut the dom wtr auto feed, it stays stable and I can bleed the air off with no reoccurrence…Is it just a bad DW auto feed valve?

  • mattmia2
    mattmia2 Member Posts: 15,191

    @HeatingHelp please make this its own thread.

    You are shutting off a feed only to a pressure reducing valve and not also to a heat exchanger for domestic hot water?

  • GPG77
    GPG77 Member Posts: 5

    It's the makeup water supply to the closed system.

  • mattmia2
    mattmia2 Member Posts: 15,191

    then the prv is leaking by. When fresh water is added and existing water is dumped out the relief valve, that fresh water that the prv lets in contains dissolved air, that is there your air is coming from.

  • GPG77
    GPG77 Member Posts: 5
    image.png image.png
  • GPG77
    GPG77 Member Posts: 5

    Any thoughts?

  • mattmia2
    mattmia2 Member Posts: 15,191

    it needs to be replaced or rebuilt.

  • GPG77
    GPG77 Member Posts: 5

    That's what I figured, but wasn't sure if there was another internal source for the pressure / air.

    Thank you ….

  • mattmia2
    mattmia2 Member Posts: 15,191

    only the coil in an indirect water heater or the heat exchanger in a combi water heater but if it stopped if you closed the manual valve for the prv and there is nothing else on that valve then it is a pretty good sign that it is the prv.

  • mattmia2
    mattmia2 Member Posts: 15,191

    that drip of water down the side of the prv isn't a great sign either.

  • HeatingHelp.com
    HeatingHelp.com Member, Moderator, Administrator Posts: 188

    @GPG77, welcome to Heating Help! I've created a new discussion for you here so that your question doesn't get lost within an older thread and to prevent confusion. Thanks.

    Forum Moderator

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