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Thread: Rocket Giotto curdling milk

  1. #1
    Member frasertr's Avatar
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    Rocket Giotto curdling milk

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi snobs,
    I used my Rocket Giotto (which I love like a wife) this morning and the steamer curdled the milk. My initial thought was that the milk was off so I threw it out and opened a fresh one (different brand, purchased separately) and the same thing happened! Ive always had great milk from my Rocket. Any ideas?!
    Tristan

  2. #2
    Senior Member flynnaus's Avatar
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    Re: Rocket Giotto curdling milk

    What milk are you using? I cant see it as being a* fault with the Giotto. Id suggest trying another different brand as the two previous bottles may have come from the same milk factory. Im not impuning the dairy coop, just that changes in feed or other factors may affect the quality of the milk the farmers supply.

    I use PaulS Smart Milk and it has consistently given me great results.

  3. #3
    Senior Member saoye's Avatar
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    Re: Rocket Giotto curdling milk

    The only way a steamer can curdle milk is if the steam itself has traces of citrus or acid. I am guessing maybe you recently descaled with citric acid? Give the steamer a good clean with the correct cleaner and flush out as much as you can. Check your water source too. your wife didnt squeeze some lemon juice in there did she ;) just kidding.

  4. #4
    Member frasertr's Avatar
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    Re: Rocket Giotto curdling milk

    Thanks guys. Youre onto something saoye. I rescaled for the first time a week or so ago. The product I used was cino clean. How do you suggest I fully flush it? My wife would never sabotage the Rocket - she loves the coffee too much!

  5. #5
    Member frasertr's Avatar
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    Re: Rocket Giotto curdling milk

    *descaled

  6. #6
    Senior Member flynnaus's Avatar
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    Re: Rocket Giotto curdling milk

    Quote Originally Posted by 4F5B485A4C5B5D5B290 link=1330555441/3#3 date=1330565890
    Youre onto something saoye
    Could be, but odd that you noticed the curdled milk "this morning". So it wasnt curdling yesterday or in the last week since you descaled?


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    Re: Rocket Giotto curdling milk

    I had a similar experience with some soymilk. I am not sure of the cause, it could have been some salt-related something in the water from the softening treatment, or maybe in the beans, but whatever it was, I steamed the soy and when I poured it into the coffee it turned into a mix of coffee and coffee-flavored tofu, [I probably dont have to add this, but..] and not in a good way. I really like tofu, and this was disgusting, and NO I didnt drink more than the first sip, realized what happened, and tossed it down the sink.. Poor sink.

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    Senior Member coffeechris's Avatar
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    Re: Rocket Giotto curdling milk

    I also used Cino descale on my machine which is a minore iv i had a hell of a time trying to get the taste of descaler out of the boilers for both the steam wand and the group head. I hope this isnt the same problem for you. Flushing it and continued use finally ended the citric acid taste.

    Chris :)

  9. #9
    Member frasertr's Avatar
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    Re: Rocket Giotto curdling milk

    Its nasty stuff Randy G. Flynn, I agree that its weird that it wouldnt have happened earlier. Potentially its not the problem. Would love other ideas. I will try again tonight. Any other suggestions for flushing the steaming system??

  10. #10
    Member frasertr's Avatar
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    Re: Rocket Giotto curdling milk

    By the way last year the machine was inhabited by ants! This Rocket is possessed by the devil - I think thats why it makes such good coffee!

  11. #11
    Senior Member saoye's Avatar
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    Re: Rocket Giotto curdling milk

    Hi frasertr,

    follow this link. This is the correct way to do a thorough descale and then to bring the machine back to service without descale still in the system.

    http://coffeesnobs.com.au/YaBB.pl?num=1274615034

    But essentially for you it means draining your Giotto via the hot water tap and steam wand (activating the pump) topping up the tank when close to empty with fresh filtered water. Youll need to at least flush a full tank worth of clean water since your boiler is about 2 L and your tank is 2.9L. Did you do that?

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    Senior Member Dennis's Avatar
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    Re: Rocket Giotto curdling milk

    Quote Originally Posted by 52404E5844210 link=1330555441/2#2 date=1330562642
    The only way a steamer can curdle milk is if the steam itself has traces of citrus or acid.
    Actually, from what Ive read, thats only one way. I understand that milk (moreso with skim) may also curdle if cooked (in this case with steam) at a high temperature.

  13. #13
    Senior Member saoye's Avatar
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    Re: Rocket Giotto curdling milk

    Quote Originally Posted by 16373C3C3B21520 link=1330555441/11#11 date=1330574697
    Actually, from what Ive read, thats only one way. I understand that milk (moreso with skim) may also curdle if cooked (in this case with steam) at a high temperature.

    Good point. I guess I was thinking of Milk going off curdling. Its to do with the lower fat content being more susceptible and high temperature. I dont use skim so never had this problem.

  14. #14
    Member frasertr's Avatar
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    Re: Rocket Giotto curdling milk

    Ive noticed tonight a really bad burning smell after using the steam wand. I think Ill have to get it serviced. Any other ideas regarding the burning smell gang?

  15. #15
    Senior Member flynnaus's Avatar
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    Re: Rocket Giotto curdling milk

    Quote Originally Posted by 485C4F5D4B5C5A5C2E0 link=1330555441/13#13 date=1330612646
    Ive noticed tonight a really bad burning smell after using the steam wand.
    It sounds like milk residue has been caught up somewhere - hopefully not the boiler. Try removing the steam tip and check for any residue and clogged steam holes. Its always a good idea after steaming milk to purge the steam wand briefly.

    If everything has been going well with the machine before all this, take it to a reputable espresso machine specialist.



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