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NO PRESSURE !!!!!

Discussion in 'Plumbing and Central Heating' started by Broddoy, 24 Jan 2012.

  1. Broddoy

    Broddoy

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    Hi guys
    I have a reavenheat boiler
    Today I drained part of the system to replace a towel rail,
    After completing the job I refilled the system using the loop under the boiler ,unfortunately the gauge remains to zero
    I have bled the rads and refilled the system but the gauge is still on zero
    I fired up the boiler and everything works fine , hot water and heating
    Even with the rads hot the pressure is still zero!!!i have switched everything off for the night to avoid damage
    Can anyone help??????
     
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  3. echoes

    echoes

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    Either:

    1) The gauge is faulty or has become blocked. What was it reading before the work?

    2) You have not pressurised the system enough. Does water squirt out if you bleed the highest radiator?
     
  4. Broddoy

    Broddoy

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    Before. I started the work on the rads pressure was just 1 bar
    But it never went over 1 bar possibly due to the fact that the boiler is in the loft
    And in answer to your question I have filled a cup of water from each rad
    Reading on other forums I have heard of a fault in some membrane and water mixing with air ???
     
  5. Mr Smyth

    Mr Smyth

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    Either the gauge is faulty or simply blocked, probably blocked.

    Kill the power and confirm its killed, drain the appliance, trace the thick wire that comes out of the back of the gauge and remove the other end probably from the return manifold. Poke through the muck that has accumulated in the connection and clean the wire end. Be careful with the o-ring but maybe a compression connection. Refill the system and test.

    Go for the unblocking first as that will tell you whether the gauge is faulty.

    Hope this helps
     
  6. Broddoy

    Broddoy

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    Thanks mr smith
    Are you familiar with this reavenheat boiler ?
    Is there a quick way to empty it ?? Or do I need to undo one of the pipes??
    I was wandering if I could use the drain pressure valve located at the bottom of the boiler
     
  7. Mr Smyth

    Mr Smyth

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    I would go for the same way you drained it before. Just releasing the pressure is normally enough.

    Not sure if this boiler has a drain point. Opening the PRV is not a good idea as it can lead to other problems.
     
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