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Worcester Bosch Greenstar 24i - Losing Pressure slowly - PRV

Discussion in 'Plumbing and Central Heating' started by be11aml, 12 Sep 2019.

  1. be11aml

    be11aml

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    Hi,

    I've read a few thread on similar issues and have been arranging registered local engineers to come and investigate. However, I would like to ask the collective wisdom of the forum for input!

    Problem is a slow pressure loss, but never down to zero. Usually sits at about 0.3 bar, if I leave it long enough. I have never seen the pressure go very high (2 bar at most). I have collected water from the PRV outlet, so I know this is passing and the pressure loss continues over summer months when only heating the cylinder.

    Recently topped up expansion vessel (system was drained) to 1 bar. There was air in it and no water squirted out!

    I can't vent the PRV to clear any debris, as the handle does not seem to be attached and comes off when I press it. Is there a way to fix this?


    Any thoughts or suggestions?

    I'm happy to try anything simple, legal and non-dangerous! Just concerned that there is an underlying issue, which will come back, after replacing the PRV


    Background

    Moved in the house 2 years ago. I think the issue has been there all along, but I have had various rads off for decorating, so assumed the top ups were linked to this.

    The system is a Greenstar 24i, Megaflo unvented cylinder, 2 radiator heating zones (4 rads and 1 towel rail downstairs, 4 rads and 2 towel rails upstairs). Also, wet underfloor heating with 4 zones (1 large room & 1 small room and 2 bathrooms)
     
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  3. happypeter

    happypeter

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  4. be11aml

    be11aml

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    thanks for taking the time to respond.

    I thought that too, but there is definitely water escaping the PRV. I put a bag over the outlet to test and it filled over a couple of weeks.

    Can't rule out any other leaks :(
     
  5. terryplumb

    terryplumb

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    Have the PRV replaced ,and the EV checked at the same time.
     
  6. ianmcd

    ianmcd

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    That is not how you do it, lots of correct explanations in the FAQs
     
  7. be11aml

    be11aml

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    I had drained the system as part of a bathroom refit, had to remove valves, tile and refit valves.

    Took the opportunity to check the EV, before refilling the system.
     
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