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Thread: Diagnose this!

  1. #1
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    Diagnose this!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Problem: shot blonding at about 10mls - about 20 secs for first drips to form, but still weak and watery tasting

    Machine -Dual boiler Giove

    Beans - purchased last week from sponsor

    Grinder - Mazzer Mini

    Boiler pressure is at 1.0-1.1 bar - is this a problem?
    Group pressure at 9.5-10 bar.

    Any ideas what I could tweak? This was only problem in the last 24 hours.

  2. #2
    Mal Dimal's Avatar
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    Re: Diagnose this!

    All the numbers look good Tashie.... :-?

    What is your dose and distribution like? Some photos or maybe a brief video starting from scratch would help a lot... :)

    Mal.

  3. #3
    Senior Member sidewayss's Avatar
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    Re: Diagnose this!

    You got great machinery there tashie. Temperature should not be a problem as the boiler size is decent, and i presume you let the machine warm for at least half hour.

    Sounds more like user error. The right dose for your basket and even tamping is the key.

    Have you played with grinder settings as well?
    If you started using different beans 24 hours ago, perhaps a notch or two coarser or finer would do the trick? Some beans have less or more oils.

    Gary at G

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    Re: Diagnose this!

    I might video this tomorrow as it is really puzzling me.

    I dont think I should grind any finer as it is already taking about 20secs for the first drips to come through.

    Will check back in tomorrow - thanks guys.

  5. #5
    Senior Member flynnaus's Avatar
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    Re: Diagnose this!

    What coffee is in your grinder at the moment? Is it a SO? When was it roasted?

    If its very fresh then it may have the appearance of early blonding?

  6. #6
    Senior Member trentski's Avatar
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    Re: Diagnose this!

    What was roast date of beans?

    Is this naked? ;) is there any sign of channeling? Im thinking, too fine and/or tamped too hard so nothing at first then boom, channel forms and its a mess from there on in.

  7. #7
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    Re: Diagnose this!

    Is it possible that the grinder setting has been changed, maybe accidentally, by someone else, or....?
    If all else is working normally, the 20sec till first drops appear sounds a lot like grind too fine.

    With the PF removed, do you have water coming out brew head in normal time and volume?

    Very unlikely, but an obstruction in the pump lines may give similar effects.

  8. #8
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    Re: Diagnose this!

    grind coarser?

  9. #9
    Mal Dimal's Avatar
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    Re: Diagnose this!

    about 20 secs for first drips to form
    Quote Originally Posted by 4A6E74646F66070 link=1311593588/7#7 date=1311651234
    grind coarser?
    Sorry mate.....

    I misread this phrase from your opening post :(. Yes, definitely start to incrementally coarsen the grind until you get the desired volume in 25-30secs, just before Blonding starts in my case...

    See how that works out and come back with the results.... ;)

    Mal.

  10. #10
    Senior Member sidewayss's Avatar
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    Re: Diagnose this!

    Overdosed and overtamped.
    The machine is working hard to push for the first 20 seconds, and when it does push through, it works through the puck with least resistance and chanells, creating blonding early and a watery pour as you have noted.
    Look at your puck. Any part looks a bit dry?
    Has the machine been serviced recently?
    Has it been backflushed and de-scaled recently?

    Gary at G

  11. #11
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    Re: Diagnose this!

    Yup, coarsening the grind worked a treat.

    I was looking for machine problems instead of starting with basics. Rookie mistake!

    I thought from the watery pour that the boiler pressure was too low (I thought 1.5 bar was standard for some reason).

    I think someone adjusted my grinder the night before *grr*

    Case solved. One for the CS archive files. Thanks everyone!

  12. #12
    Senior Member trentski's Avatar
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    Re: Diagnose this!

    Quote Originally Posted by 7267756E6F63060 link=1311593588/10#10 date=1311745132
    I think someone adjusted my grinder the night before *grr*

    Im the only coffee drinker in the house and I use the same excuse, I think its the cat ;D

  13. #13
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    Re: Diagnose this!

    Thanks Tashie and others for this informative little thread,

    I have now coarsened my grind marginally, as I think my cat, like Trenskis, has been fiddling with the dial. Trouble is, I dont live alone... and its getting harder and harder to keep other people away from my coffee equipment... my precious shiny things... ::)

  14. #14
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    Re: Diagnose this!

    mark (with whiteout or similar) where your grinder is adjusted properly and if you have a decent one, it should still be adjusted if you bring it back to that mark. If its just a cheapy well chances are it wont be adjusted properly when you bring it back :) At least it will save you from wasting a few shots before you realise its been fiddled with!

  15. #15
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    Re: Diagnose this!

    The cats! I knew it - I have four cats so that explains a lot.

    :)



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