How do i reduce pressure on my boiler

Discussion in 'Screwfix' started by WelderCrafts, Feb 11, 2020.

  1. WelderCrafts

    WelderCrafts New Member

    My boiler has been over pressurised and is pouring water out the relief valve i believe.
    Had to turn off the mains to prevent it from flooding the house.
    The boiler is a Greenstar 30Si MKIII.
    Any advice would be much appreciated.
    Thanks in advance =)
     
  2. Wayners

    Wayners Well-Known Member

    Blead a rad. Need to catch water
     
    WelderCrafts likes this.
  3. terrymac

    terrymac Well-Known Member

    Have you checked the filling loop , may not be fully closed ?
     
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  4. WelderCrafts

    WelderCrafts New Member

    Ive been bleeding the radiator took out buckets of water pressure didnt really budge that much
     
  5. WelderCrafts

    WelderCrafts New Member

    Ive checked its fully closed its still holding 3 bars.
    when i switch the boiler on it starts gushing out with water
     
  6. nigel willson

    nigel willson Well-Known Member

    Looks like your filling loops u/s disconnect it. If water flows from it it’s knackered
     
  7. WelderCrafts

    WelderCrafts New Member

    Wouldnt it make a sound like water passing through if its not functioning theres only one stop off valve on mine.
    Taking it off might cause a whole new nightmare
     
  8. terrymac

    terrymac Well-Known Member

    Can you please post pics of the filling loop.
     
  9. WelderCrafts

    WelderCrafts New Member

    For some reason it doesnt allow me to send pictures says file is too large
     
  10. terrymac

    terrymac Well-Known Member

    Reduce the file size ??
     
  11. WelderCrafts

    WelderCrafts New Member

     

    Attached Files:

  12. terrymac

    terrymac Well-Known Member

    The black handle may not be fully engaging on the shaft. It's held on with a screw ,remove the screw and pull off the black handle. See if it's cracked. It sits on a square shaft which you can turn with a spanner once the black handle is removed.
     
  13. WelderCrafts

    WelderCrafts New Member

    Il try that now and let you know what happens.
    Thanks so much for the help
     
    terrymac likes this.
  14. terrymac

    terrymac Well-Known Member

    Actually ,the handle looks to be in the open position !! Try moving it to vertical .
     
    Astramax likes this.
  15. nigel willson

    nigel willson Well-Known Member

  16. WelderCrafts

    WelderCrafts New Member

    My friend your a genius its all sorted thanks again n again i really appreciate i can now turn the heaters on and stay warm all thanks to you.
    I bought in a boiler man he told me i need a new boiler or change out some parts.
    When alls it needed was the valve closed i bet hes the one who did it after all he did want 350 labour n parts.
    Hopefully i can be of some day perhaps on the metal working side boilers are just not my thing salute!!!!
     
  17. terrymac

    terrymac Well-Known Member

    Great ,where shall I send my invoice !!
     
  18. WelderCrafts

    WelderCrafts New Member

    LooL invoice??? Running to the nearest exit
     
  19. terrymac

    terrymac Well-Known Member

    Ha ha !! You need to reduce pressure to around 1 bar now. Be aware that sometimes when relief valve has opened ,they don't close fully. Keep an eye on the relief pipework . If you start to experience pressure dropping ,that probably the reason.
     
  20. WelderCrafts

    WelderCrafts New Member

    Will keep an eye on it.
    ive represurised it to 1 bar hopefully all goes well.
    Do have a wonderful evening
    Many thanks
     
    terrymac likes this.

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