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Nuova Simonelli Oscar... HELP
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Discussions > Espresso > Machines > Nuova Simonelli...  
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guitarboyled
Senior Member


Joined: 3 Oct 2009
Posts: 27
Location: Montreal Canada
Expertise: I live coffee

Posted Sun Dec 26, 2010, 9:33pm
Subject: Nuova Simonelli Oscar... HELP
 

I just bought a used Oscar and I'm having some problems with it.

My past machines were all Saeco with the presurised portafilter therefore I'm new to let's say "less forgiving machines".

Q1- Is it normal for water to intermittently stop coming out of the group even when the pump keeps running.

It's probably related to this issue but it takes a minute to poor a shot with standard grind barely pressed and I noticed the bypass tray under the spill tray fills up fast. Is this a pump problem or some sort of valve not acting up right?

Q2- It seems the vapor is extremelly hot, I only have a few seconds before the milk boils. Is this normal?

Q3- Is it normal for the vapor knob to turn non stop when I turn off the vapor?

Q4- Where would be the cheapest place for parts (the plastic casing is cracked) NS Italy, NS USA, a dealer, etc.?
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JonR10
Senior Member
JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Mon Dec 27, 2010, 7:28am
Subject: Re: Nuova Simonelli Oscar... HELP
 

guitarboyled Said:

Q1- Is it normal for water to intermittently stop coming out of the group even when the pump keeps running.

Posted December 26, 2010 link

No, this is not normal.  It sounds like the machine may have some blockage in the line (i.e. scale or maybe coffee sludge builup in the group).  My guess is that it probably is not pump failure because it is intermittant and a fading pump would just fade and stop.  Some form of blockage might explain also why you're getting so much bypass to the drip pan.  



guitarboyled Said:

Q2- It seems the vapor is extremelly hot, I only have a few seconds before the milk boils. Is this normal?

Posted December 26, 2010 link

Yes, it's normal.  The Oscar is a very strong steamer.  You might want to plug a couple of the holes in the steamtip to slow it down to make it easier to texture the milk.  I have used toothpick pieces to do this in the past, but my experience is on other machines so be careful to make sure you can remove the toothpicks easily and that they can't get up inside the steam wand.  

guitarboyled Said:

Q3- Is it normal for the vapor knob to turn non stop when I turn off the vapor?

Posted December 26, 2010 link

Sorry - I do not know for sure but it sounds kind of strange to me.  Other machines I've had in the past had a "hard stop" for the steam knob.

guitarboyled Said:

Q4- Where would be the cheapest place for parts (the plastic casing is cracked) NS Italy, NS USA, a dealer, etc.?

Posted December 26, 2010 link

I use Cafeparts.com most of the time, but I don't know about parts for NS machines so much.  If you can't find it there you might check out espressoparts.com for harder-to-find items.

 
Jon Rosenthal
Houston, TX
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guitarboyled
Senior Member


Joined: 3 Oct 2009
Posts: 27
Location: Montreal Canada
Expertise: I live coffee

Posted Mon Dec 27, 2010, 9:22am
Subject: Re: Nuova Simonelli Oscar... HELP
 

I did a few backwash and will try descaling. I'll try to post a video on youtube tomorrow.
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guitarboyled
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Joined: 3 Oct 2009
Posts: 27
Location: Montreal Canada
Expertise: I live coffee

Posted Mon Dec 27, 2010, 10:38pm
Subject: Re: Nuova Simonelli Oscar... HELP (update)
 

UPDATE UPDATE UPDATE

The water actually pours out non stop of the group when the machine is just started (cold) but it intermittently stops once the machine gets hot.

And I was wrong about the bypass... there's actually no water going to the drip pan. I don't know if the water simply stops feeding to the group or if it's sent back to the boiler.

Once hot, the machine has a hard time pushing water through the portafilter with even an average fine grain (that my Saeco wouldn't have problems with).

Last test I did, there was absolutely no water pouring out of the portafilter and coffee was barely tampered.

The pump seems to work ok when the machine is cold.

Is it a pump problem, a 3 way valve problem or a sensor problem? Is there something I can adjust or does some piece need to be replaced?
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guitarboyled
Senior Member


Joined: 3 Oct 2009
Posts: 27
Location: Montreal Canada
Expertise: I live coffee

Posted Tue Dec 28, 2010, 2:03pm
Subject: Re: Nuova Simonelli Oscar... HELP (update)
 

Here is the machine running cold:

http://www.youtube.com/watch?v=DeHKiXrNQGI


Here is the machine running hot:

http://www.youtube.com/watch?v=iA0FChC8Tvw



*
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fwtechwiz
Senior Member


Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Sat Jan 1, 2011, 6:57am
Subject: Re: Nuova Simonelli Oscar... HELP (update)
 

Could be your pressurestat is failing intermittently.  I found an interesting post on the pressurestat for an Oscar, at this link:

click here

If you're machine is not equipped with the Sirai pressurestat, it might be a good idea to switch it out for one.  Opinions are that the sirai is a much better build quality and not prone to over pressure/failure problems.
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ethom
Senior Member


Joined: 24 Nov 2012
Posts: 65
Location: Pittsburgh
Expertise: I like coffee

Espresso: NS Oscar, Silvia broken :o(
Grinder: Vario
Drip: Bosch
Posted Thu Dec 20, 2012, 6:11pm
Subject: Re: Nuova Simonelli Oscar... HELP
 

guitarboyled Said:

Q3- Is it normal for the vapor knob to turn non stop when I turn off the vapor?

Posted December 26, 2010 link

This just happened to my Oscar today - the steam knob would turn and turn with no stop although the valve did still open and close.  It was disconcerting not knowing whether the valve was really shut off.  Pulling off the steam knob showed the problem - the brass set nut had come loose. Tightening it with my fingers brought the on and off stop points back.
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