1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Airlock?

Discussion in 'Plumbing and Central Heating' started by Ryler, 18 Aug 2020.

  1. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    The cold water cistern was drained down to fix a tiny crack in the plastic.
    Refilled and now the bath and wash hand basin cold taps have stopped working.
    Just a tiny dribble from the bath cold.

    Tried mains pressure to blow out an air lock and just got blasted in the face with water as though the tap was turned off. (old gravity feed taps)
    Any ideas.
    The guy is without bathroom water since saturday.
    I was only there to platform the loft for a new set up.:(
    The guy drained it down himself.
    All I did was apply some mastic to stop the leak.
     
  2. Sponsored Links
  3. Nozzle

    Nozzle

    Joined:
    23 Dec 2012
    Messages:
    2,199
    Thanks Received:
    289
    Location:
    Suffolk
    Country:
    United Kingdom
    Scale/silt sucked through the pipe from the head tank. Now blocking somewhere.

    Nozzle
     
    • Thanks Thanks x 1
  4. Elkato531

    Elkato531

    Joined:
    22 Jul 2009
    Messages:
    1,085
    Thanks Received:
    277
    Location:
    Sussex
    Country:
    United Kingdom
    Check the pipe runs from the loft. Sometimes there is a section that's horizontal or slightly uphill. Just simply lifting the pipe to allow air to rise back to the tank is sometimes all that's needed.
    You can also try a wet vac on the tap to pull the air lock through. It could be sediment from the bottom of the tank causing blockage. This would normally block where there is a restriction (isolation valves or under tap washers is possible).
    Was the gate valve closed at any point? Is it fully open now. Old ones can break inside and not open again.
    I did once have to disconnect the mains supply to the tank and attach a length of hosepipe to it. I stuffed the other end down through the tank outlet and pushed some mains pressure water through.
     
  5. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Plumber was on site this morning.
    He pushed the mains hose down the cold inlet at the cistern and flushed from there.
    Seems it was an air lock. I'm told.

    Am mystified as to why it didn't flush from the tap end.
    Unless the original plumber had a non return valve fitted somewhere.
     
    Last edited: 19 Aug 2020
  6. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    5,455
    Thanks Received:
    1,105
    Country:
    United Kingdom
    You mentioned they are old gravity fed taps which could have loose jumpers in them. If you try to push water up through them you can't, the jumper may drop and close them off.
     
    • Thanks Thanks x 1
  7. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    12,948
    Thanks Received:
    1,982
    Location:
    Hertfordshire
    Country:
    United Kingdom
    Where was the crack? was it below the water line?

    Andy
     
  8. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Beside the cold outlet.
     
  9. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    12,948
    Thanks Received:
    1,982
    Location:
    Hertfordshire
    Country:
    United Kingdom
    So how did the customer know it was cracked?

    Andy
     
  10. Sponsored Links
  11. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    They didn't.
     
  12. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    12,948
    Thanks Received:
    1,982
    Location:
    Hertfordshire
    Country:
    United Kingdom
    So what made you go into the loft?

    Andy
     
  13. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    5,455
    Thanks Received:
    1,105
    Country:
    United Kingdom
     
  14. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    What is this?
    The spanish inquisition?:ROFLMAO::ROFLMAO::ROFLMAO:
     
    • Thanks Thanks x 1
  15. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    12,948
    Thanks Received:
    1,982
    Location:
    Hertfordshire
    Country:
    United Kingdom
    Jesus wept, it's like pulling teeth.

    So there was no leak, you went into the loft to: 'I was only there to platform the loft for a new set up'

    They had a plumber on site but you filled a crack in the CWST, if it was new then it should of being replaced by the plumber.

    Andy
     
  16. Ryler

    Ryler

    Joined:
    21 Oct 2019
    Messages:
    2,490
    Thanks Received:
    165
    Country:
    United Kingdom
    Water was coming down the wall.
     
  17. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    12,948
    Thanks Received:
    1,982
    Location:
    Hertfordshire
    Country:
    United Kingdom
    So you fixed a new CWST with silicone?

    Andy
     
Loading...

Share This Page