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Thread: Strange aberration with steaming

  1. #1
    Senior Member Rocky's Avatar
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    Strange aberration with steaming

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I am posting this thread here because it is probably not being seen in the "Milk..." section.
    Talking about a Diadema Perfetta here. A couple of months ago I noticed that one of the two steam holes in my wand was not working properly and I gave it a gentle ream-out with a needle.
    It hasn't steamed properly since.
    The Perfetta is a powerful steamer normally but now seems more so.
    I have been trying to steam with it turned right down but once the milk temp is warm (condensation on side of jug disappears) the temp on my thermometer roars up to 70 in a few seconds and the milk is NOT textured.
    Is it possible for there to be a thermostat problem with this machine in relation to steaming?
    It's as though the steam is way too hot.
    I have not been able to produce microfoam since I gave the nozzle a ream - which doesn't make sense to me.
    If I can't sort this I will have to get rid of the machine. There are no coffee machine technicians up here in the sticks.
    Any suggestions?

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    Mate, pretty much exact same thing happened with my dual boiler a few months ago!

    After 2 years of trouble free use, I noticed one of the three holes in the wand was intermittent, so I soaked the tip and cleaned the blocked hole with a needle. This cleared the blockage, however I immediately found I could no longer produce nice consistent micro foam. It seems to have increased the volume/power of steam to a level that makes it near impossible to control.

    I’ve wasted litres of milk trying to re learn how to steam again - without much success. My dual boiler is PID controlled so I doubt it’s a temp related issue.

    Perhaps more than likely I’ve damaged/widened the tip. I’m yet to try finding a replacement tip, but it’s on my list of things to do.

  3. #3
    Senior Member flynnaus's Avatar
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    Some suggestions: try reaming the other two holes with the same needle, block one of the holes again (with a toothpick) or buy a new steam nozzle (2 hole?)
    Dimal likes this.

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    Mal Dimal's Avatar
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    Agree with Steve Rocky...

    Before doing anything drastic, try a new steam tip or two. They're not expensive and will maybe give you a couple of extra options...

    Mal.

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    Senior Member Rocky's Avatar
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    The thing I don't get, is why a gentle clean with the needle would make any difference other than to return the steam tip to it's original function. It's not like I made the hole any bigger than it was originally.
    Even if you did increase the size of the hole/s, reason says you should be able to control the volume of steam simply by turning down the tap.
    In any case, it's not about the volume of steam - it's about the heat. The temp just roars up and it's not a faulty thermometer because if you ignore the thermometer and continue to steam it separates the milk.
    The Perfetta has always been a great steamer but this is ridiculous.
    Is there thermostat control of the steaming function on a single-boiler? It's as though a thermostat has failed.

    Just saw your post, Mal. I will contact Chris in Melbourne and see if he can supply a new tip (I tried to get the thing off but it seemed like it was a fixture)

  6. #6
    Senior Member flynnaus's Avatar
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    Quote Originally Posted by Rocky View Post
    The thing I don't get, is why a gentle clean with the needle would make any difference other than to return the steam tip to it's original function. It's not like I made the hole any bigger than it was originally.
    Even if you did increase the size of the hole/s, reason says you should be able to control the volume of steam simply by turning down the tap.
    In any case, it's not about the volume of steam - it's about the heat. The temp just roars up and it's not a faulty thermometer because if you ignore the thermometer and continue to steam it separates the milk.
    The Perfetta has always been a great steamer but this is ridiculous.
    Is there thermostat control of the steaming function on a single-boiler? It's as though a thermostat has failed.

    Just saw your post, Mal. I will contact Chris in Melbourne and see if he can supply a new tip (I tried to get the thing off but it seemed like it was a fixture)
    By cleaning the hole, you would have increased the volume of steam and hence this will drive the temperature up more quickly. You're right that it doesn't seem right that it makes as much difference as you noted, but it is highly unlikely that the thermostat would go on the blink at the same time as you unblock the hole.you can regulate the boileb temp to vary the steam volume but this is best left to the experts as it will affect brew temperature and may require playing with a few variables to properly calibrate.

    In general, the more holes the steam tip has, the greater the volume of steam it can produce but it also depends on the diameter of the holes. Can't comment on the operation of the steam valve on your machine. It makes sense that, if you were getting good results from what was effectively two holes, a two hole tip might solve your problem. Looking at pictures of the Perfetta, the steam tip definitely looks removable. If it doesnt easily come off, it might require a bit of WD40 to loosen it up.

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    Quote Originally Posted by moreCoffee View Post

    Iíve wasted litres of milk trying to re learn how to steam again - without much success..
    A good tip when trying to dial out a steaming issue. Instead of wasting milk, you can experiment with cold water plus a single drop of dishwashing liquid.

    It will stretch in the same way as milk, and help you solve the issue without wasting stacks of milk.
    topshot likes this.

  8. #8
    Senior Member Rocky's Avatar
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    Thanks Flynn, yes, it is too much of a coincidence for there to be a problem with a thermostat develop at exactly the same time as I cleaned the steam hole.
    I normally do Long Blacks and there is nothing different in the way the machine functions in making those. If there was a thermostat problem you would think that it would affect the pour also (???)
    Does anyone know whether there is a thermostat involved in the steaming function for a single boiler like the Perfetta?

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    Senior Member topshot's Avatar
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    Quote Originally Posted by herzog View Post
    A good tip when trying to dial out a steaming issue. Instead of wasting milk, you can experiment with cold water plus a single drop of dishwashing liquid.

    It will stretch in the same way as milk, and help you solve the issue without wasting stacks of milk.
    Great tip!

    This is how I taught myself to texture milk years ago, costs next to nothing!

  10. #10
    Mal Dimal's Avatar
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    Quote Originally Posted by Rocky View Post
    Does anyone know whether there is a thermostat involved in the steaming function for a single boiler like the Perfetta?
    Pretty sure it does Rocky...
    A quick call to CosmoreX Coffee's service dept. would be able to verify exactly how the Perfetta is set up and the cost of a new T/stat if you needed it.

    Mal.

  11. #11
    Senior Member Rocky's Avatar
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    I phoned the Cosmorex Service Dept a couple of times over several weeks but as you would expect, the Technician is a busy fellow and impossible to catch.
    I asked for calls-back but I imagine he has better things to do than try to trouble-shoot parts over the phone.
    The parts diagram for the machine seems to indicate that there are two small thermostats as well as the main (Prodigy) thermostat.
    If this is the case then it lends creedence to the idea that the one for the steamer has failed.
    What do others think?


  12. #12
    Mal Dimal's Avatar
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    G'day Rocky...

    Send me a PM mate and I'll see what I can do to try and troubleshoot this for you...

    Mal.

  13. #13
    Senior Member Rocky's Avatar
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    Behmor Brazen - $249 - Free Freight
    This is a win.
    I eventually just phoned Cosmorex Canberra and ordered both the Water and Steam sub-thermostats. Total $50.
    Installed the Steam one (145 degree one) this am prior to 'Saturday Morning coffee time'. Nice easy install.
    Steaming back to normal. Son gets some microfoam on his flat-white again.
    This is the culprit.

    Dimal, flynnaus and Squeeek like this.



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