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Back duo-tec won't pressurise!

Discussion in 'Plumbing and Central Heating' started by ottosump, 30 Dec 2016.

  1. ottosump

    ottosump

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    Hi group, I have a back duo-tec which I can't depressurize. Tried following the guides provided on the site & you tube but to no avail. Any combination of the valves doesn't alter the pressure. Can't hear any water flowing through the system. Any advice appreciated, regards Otto
     
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  3. gas112

    gas112

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    do you have built in filling loop ? does it have levers or knobs
     
  4. ottosump

    ottosump

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    Yes it has a filling loop (I think) 3 black valves on the rear, all open. x2 black knobs on the front ofset to the right. these are closed. opened them but nothing happens?
     
  5. Stadan20

    Stadan20

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    Sounds like stuck checkvalve on filling loop
     
  6. ottosump

    ottosump

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    maxresdefault.jpg
    Thank you for the response, could you identify the check valve from the attached picture? Regards Otto
     
  7. gas112

    gas112

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    These wheel ones were a nuisance they turn on by opening them in different directions left hand one is anti clockwise righthand clockwise (i think or vice versa) . check valve is the larger of the two and were prone to sticking you could try giving it a gentle tap with spanner or large screwdriver
     
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  9. Stadan20

    Stadan20

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    Yup agree with gass 112 , turn left one away from you and right on toward you , vise versa for closing down , but saying that I have had a lot where the plastic wheel head sheers off
     
  10. dreadnoughtheating

    dreadnoughtheating

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    occasionally you need to fully open them, and I mean all the way to the stop location, to get anything flowing through.

    After trouble with the earliest ones, I resorted to putting in 'old skool' filling loops separately to avoid troublesome call-backs.
     
  11. ottosump

    ottosump

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    The left hand check valve HAD seized, I had to remove it and poke about with it before it came free. Alls well now and boiler has been re-pressured.
    I've seen a similar set up with braided hose, could i replace these for a braided hose to alleviate further troubles.
    Thank you for all the advice guys, much appreciated.
    Otto, West Cumbria
     
  12. ottosump

    ottosump

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  13. Stadan20

    Stadan20

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    Or just smash the check valve out :)
     
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