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Vaillant Turbomax Plus Boiler - Pressure too high

Discussion in 'Plumbing and Central Heating' started by Janie21, 31 Dec 2011.

  1. Janie21

    Janie21

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    Hi there

    I checked the pressure on my boiler the other day and it was less than zero, yet appeared to be working correctly.

    We added additional water to the system to the 1.2 mark, and bled the radiators as the manual suggested. Yet, since the heating has been turned on, the pressure went to over 2 and water was pouring out at the top of the boiler system. It seemed as though 2 x 'O' rings were poorly, so we replaced those too.

    Now the boiler doesn't make the horrid clanging noises that it used to, and no further water is appearing, but still the pressure rises very high....over 3 at one point.

    We have bled the radiators to remove some of the pressure, but the pressure still seems very erractic.

    Would anyone know what is the best thing to do, I am very worried that something else has gone wrong on it? :(

    Many thanks for your help.
     
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  3. Andygasman2010

    Andygasman2010

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    Do a search for "recharging expansion vessel" or "repressurising expansion vessel" it's a common problem.
     
  4. Whitespirit66

    Whitespirit66

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    Just done one yesterday with same problems. If it's 7 years old or more (approx), look down the back of the boiler from above. The red expansion vessel has a cap on a car tyre type valve. With boiler cool, and pressure between 1 and 1.5 bar, remove the cap, and press pin inside valve.

    If water spurts out, new expansion vessel time. :cry:

    If not, check pressure as said above.
     
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  5. Janie21

    Janie21

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    Many thanks for all the help, ill give it a try and post the outcome :)
     
  6. Bunnyman

    Bunnyman

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    White spirit what r u on about lol! Follow the instructions about pressurising ev or better still ring someone an book a service with a specialist
     
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  8. Whitespirit66

    Whitespirit66

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    Bunny

    Unless I mis-read the post, Diaphragm could be kaput. Have seen 2 or 3 over last year, all between 6 and 8 years old with duff diaphragms.

    Obviously, I don't have your in depth Vailant knowledge, but symptoms may point in this direction.
     
  9. Janie21

    Janie21

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    As mentioned, it was squirting water :(

    Many thanks for everyone's help on this, you've all been great :D
     
  10. Whitespirit66

    Whitespirit66

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    Its likely that the diaphragm in your expansion vessel has gone. You can get it replaced, but on the Turbo, the boiler needs to come off the wall. A cheaper alternative may be to fit an external expansion vessel to the boiler's heating return pipe near the boiler.
     
  11. Bunnyman

    Bunnyman

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    We have had this before please follow the instruction to repressure ev first, the exp vessels do leak around the seam of the diaphram if it's bin flat a long while when they r repressured the diaphram can seal back in the seam . However if the diaphragms split u had it but it's worth a try!
     
  12. DIYnot Local

    DIYnot Local

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