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Pressure loss cause ?

Discussion in 'Plumbing and Central Heating' started by micktheminer, 25 Mar 2020.

  1. micktheminer

    micktheminer

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    Location:
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    Any C/H Engineers "stuck at home" able to assist please ?
    I've got an oil fired Worcester boiler in my bungalow that supplies the c/h rads via a pressurised c/h circuit.
    The dhw is gravity fed from loft tank into the hot water cylinder in the airing cupboard.
    All controlled via conventional programmer etc.
    Problem is the pressure gradually drops from 1.1 bar down to around 0.8 every 2-3 days and if the boiler isn't used for a few days it drops down to almost zero, i've been away for a week a few times this year and each time pressure has dropped to almost zero.
    Any thoughts and possible remedies appreciated.

    Thanks
     
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  3. KenGMac

    KenGMac

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    Most obvious is a leak in the distribution system to the Rads, or indeed a Rad itself?

    Start with a check on the rads and pipes rising to them.

    If nothing then there "May??" be an under floor leak within the distributing pipe work

    Easiest option is to commence by looking at all / any exposed easy to get to distributing pipes even up to the hot tank, and indeed the hot tank itself where the pipes from the boiler enter the tank.

    Ken
     
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  4. micktheminer

    micktheminer

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    Thanks for the reply.

    I've checked all rads and pipework that is accessible but most of it is in/under the concrete floor over the bungalow and can't be got at. The probs been there for some time and if there was a leak somewhere under the floor I would have thought that it would poss have shown somewhere by damp carpets etc ? but theres no sign of it.
    I've kept the system topped up via the filling loop.

    Pic attached of inside the boiler cupboard which perhaps shows better what type of system it is, the top of the floor standing boiler can just be seen.
     

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  5. HERTS P&D

    HERTS P&D

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    Get a thermal camera, turn heating on and check all floors.

    Andy
     
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  7. CBW

    CBW

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    Depends on how “under” the floor it is, if it’s encased in concrete/screed probably wouldn’t show. Have you checked the safety discharge pipe? (The vertical pipe that runs behind your vessel).
     
  8. HERTS P&D

    HERTS P&D

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    I have a thermal camera and can see heating pipes in screed no problem.

    Andy
     
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  9. CBW

    CBW

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    Sorry, I meant on OP’s carpet :oops:
     
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  10. micktheminer

    micktheminer

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    Excuse my lack of tech talk but if the vertical discharge pipe is the prv outlet then yes I check it often and its dry.
     
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    DIYnot Local

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