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Discuss Worcester Greenstar 24ri - Possible airlock? in the Gas Safe Register Forum - Public Forum area at UKPlumbersForums.co.uk.

  1. JE-P&H

    JE-P&H GSR

    Just water, I have now changed the pump still the same have also swapped Flow and Return round above the boiler temporarily to see if that does anything and no luck! Baffling me system was quite old fully pumped system before but had no motorised valves etc just a Damfoss mixing valve controlling the hot water temperature anything I could have missed?
     
  2. JE-P&H

    JE-P&H GSR

    Photo of pipework before I took cylinder out if that helps!

    I have labelled them left to right as they come out of the floor Boiler flow, Boiler Return, CH Return and CH Flow anyone disagree?

    IMG_3421.JPG
     
  3. Gasmk1

    Gasmk1 GSR

    is pump on flow or return might make a difference
     
  4. JE-P&H

    JE-P&H GSR

    I would say Flow? From the picture above it pumps to the cylinder and is on the flow pipe into cylinder?
     
  5. Chuck

    Chuck Active Member

    Deleted after I re-read the OP.
     
  6. JE-P&H

    JE-P&H GSR

    Here's a picture just after I changed the pump with my pipework anyone see anything I'm out of ideas now haha!

    IMG_3443.JPG
     
  7. Gasmk1

    Gasmk1 GSR

    I think you should have put an air vent on the top of the heating coil, could be locking up there
     
  8. JE-P&H

    JE-P&H GSR

    Where do you mean top of the coil? I don't think it's an air lock anymore I've put mains water through the system right up to the tank and still boiler flow doesn't even get hot heat exchanger just overheats.
     
  9. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    As @ShaunCorbs@ShaunCorbs mentiond earlier it might be your pump itself. @Gasmk1@Gasmk1 said you should put an AAV on top of the coil which means where the inlet to the coil is - basically close to the coil entrance. If there is no airlock anymore try getting another pump that's what I would to see if there is any difference.
     
    • Disagree Disagree x 1
  10. Chuck

    Chuck Active Member

    This is turning into quite a mystery.

    Neither of the following are likely, just trying to think outside the box:

    Can you be sure that the coil in the cylinder is not blocked? Perhaps a manufacturing problem. Perhaps some bungs to stop debris getting in that needed to be removed...

    I can't see from the photos, does the cylinder have a secondary return? Is it possible you connected to this and capped the primary return instead of vice versa.
     
    • Like Like x 1
  11. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    Perhaps you mixed some pipes
     
  12. JE-P&H

    JE-P&H GSR

    If the coil was a blocked surely CH and bypass would still work so boiler would still fire?

    No secondary return on the cylinder just your standard fittings, I didn't cap any pipes tee all the returns in together and used the CH Flow. Open to suggestions if I've mixed something up? I checked the installation instructions for the old damfoss mixer and return comes out the bottom as I expected.

    It also now has a new pump on no change!

    Got Worcester coming tomorrow to check the boiler to rule that out, took the flow and return off and blew through to ensure no blockage etc. All clear!
     
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Have you opened port valves manually ?

    Do you get any heat up to where the pump is ?
     
  14. JE-P&H

    JE-P&H GSR

    Ye opened them manually, no heat and the pump heat doesn't get past the top of the boiler it basically boils itself in about 10-20secs then flow sensor cuts in! Takes a while to cool then same again!
     
  15. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    There is only one thing left the boiler itself. It would be quite weird if the boiler is ok.
     
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