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Vailant TURBOmax 242E / 282E water pressure greater than 1.5

Discussion in 'Plumbing and Central Heating' started by number25, 11 Jun 2008.

  1. number25

    number25

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    I hope someone can help me?
    I have a Vailant TURBOmax boiler which is overflowing water out of the "overflow" pipe from the boiler. I have noticed that the pressure is way too high, the instructions indicate that this should not be more than 1.5bar - but it is reading off the gauge - 4bar! If I run the cold water then the pressure drops - obvious? but soon creeps back up when turned off.
    I can only think that the overflow is due to the pressure? Anyone help with this? We have no hot water - I have turned off the water to the unit as this is the only way to stop the leak! Please, can someone help? Thanks, Richard
     
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  3. petit_pablo

    petit_pablo

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    Either the filling loop is wide open or the plate heat exchanger is perished internally and passing mains water through to the heating side
     
  4. number25

    number25

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    The filling loop has one tap on it - is this a pressure tap?
     
  5. petit_pablo

    petit_pablo

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    It allows you to fill the system up when its low / empty. The tap should be turned across the pipe.
     
  6. number25

    number25

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    OK, Thanks, but just to confirm..... should this be closed? I have turned it to a position where the gauge is reading 1.5bar - but I am getting a drip every 30 seconds or so. Sorry, but new house and getting used it! I noticed the water pouring out this morning, but I have just got round to seeing to it!!!!
    Many, many thanks for your help.
     
  7. petit_pablo

    petit_pablo

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    Yep should be closed.

    That will be the cause of the dripping. The Pressure Relief Valve is passing. You can find it at the back under the boiler on the right hand side. Probably a greyish colour plastic cap. You can try snapping this closed a few times and see if it reseats. (might have to top up pressure a bit after this exercise)
     
  8. number25

    number25

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    Many thanks - Best regards, Richard
     
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