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Challenge with Nuova Simonelli Oscar
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GROSSR
Senior Member


Joined: 27 Dec 2012
Posts: 15
Location: Jersey Shore
Expertise: I like coffee

Posted Sat Jun 8, 2013, 7:46pm
Subject: Challenge with Nuova Simonelli Oscar
 

The shots on the machine are great.  I cleaned the machine and backflushed it.  I then pulled a good shot.   A couple of days later, I turned it on and noticed the power light, dispense light and the heating light were all on.  I didn't think the dispense light should be on, but who notices these details.  About 10 minutes later I notice steam coming out of the group head as it it was overheating.  That was certainly new.  I pulled the shot and after I turned off the dispense button water come out of the PF for about 1 minute.  Almost like a fine mouse tail.  Not heavy, but none the less it didn't fully cut off.

I bought the machine used from a friend in SC in December who said the machine was completely overhauled about 5 or 6 month before .  

I get great shots, but something is not right.  Any thoughts would be appreciated.

thanks

rich
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GROSSR
Senior Member


Joined: 27 Dec 2012
Posts: 15
Location: Jersey Shore
Expertise: I like coffee

Posted Sun Jun 9, 2013, 4:29am
Subject: Re: Challenge with Nuova Simonelli Oscar
 

And the drama continues...This morning I plug the Oscar in and it clicks like crazy, so fast is the clicking it almost sounds like a buzz, then pop, a puff of smoke, not steam, comes out of the machine.

As the Beatles used to say Help, I need somebody...HELP

rich
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DanoM
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Joined: 20 Mar 2013
Posts: 385
Location: Los Angeles
Expertise: I love coffee

Espresso: Bezzera Strega, '84 La...
Grinder: Compak K10, Kludge grinder,...
Posted Sun Jun 9, 2013, 8:36am
Subject: Re: Challenge with Nuova Simonelli Oscar
 

I have an Oscar that I recently went through a refurb with.  The Gicar controller was malfunctioning setting off lights all over the place, and eventually it didn't fill the boiler with water when the heater was engaged - costing me the price of a heating element on top of the Gicar controller.  (I purchased my controller from Espresso Parts, as they were the cheapest source.  There is also a guy in Washington that rebuilds the controllers too.)

When flushing the boiler some of the citric acid must have dripped/splashed on one of the indicator lights and I also saw popping, hissing and 'smoke' when it was tested with power engaged.  Flushing that light with water, drying, ensuring it was clean dealt with that issue just fine.

So first thing I would check is to make sure the hissing/smoke isn't coming from the light area.  (You should be able to tell with the cover off.)
After that my next suspect would be the Gicar controller under the base your other issues.
And keep an eye on the water usage, if it's not filling the boiler then be careful so you don't burn out the heating element like I did.

Unfortunately my knowledge of the Oscar mostly ends there, but maybe that gives you some information that could help.

Best of luck.
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GVDub
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Joined: 25 Jan 2008
Posts: 864
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600+
Posted Sun Jun 9, 2013, 9:01am
Subject: Re: Challenge with Nuova Simonelli Oscar
 

If you've let the magic smoke out of one of the components, I don't advise turning it back on, as that may damage other components. You need to get a multimeter out and check continuity on all connections. It may be the relay on the p-stat, it could be the solenoid on either the 2-way or 3-way valve, it could be the pump relay or the pump itself, it could be the controller. Water flowing after the brew switch is turned off might point to a problem with the 3-way valve (it's not reseating properly after the power is removed from it) or the 2-way valve (it's not switching properly from brew to boiler fill and water is going both directions at the same time. Many different possibilities for what the problem could be.

If you're at all DIY inclined, get the parts manual and (if you can find one) a service manual) and start trouble shooting. It's a great way to learn how your machine works, which can only help in future maintenance issues. If you're not, it's time to look for a service provider.
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GROSSR
Senior Member


Joined: 27 Dec 2012
Posts: 15
Location: Jersey Shore
Expertise: I like coffee

Posted Mon Jun 10, 2013, 11:38am
Subject: Re: Challenge with Nuova Simonelli Oscar
 

I unplugged it for about an hour, and had to give it a try.   The machine worked just fine, however, the shot had zero crema, it could be the beans, they are 4 days old and I just roasted them.  But the shot was hot, steam got to 160 with no issue, but the water still ran so I had what looked like a 6oz shot.  Had to throw that away, did another shot, no crema again, but had to pull the mug from under the PF.  It flowed water for another 45 seconds.

Considering it works, which of those items you listed would you recommend I start with first?

Is there a way to test the controller?  Last couple of shots I pulled I didn't hear the pump run.  I will pull a shot went it first is powered on an see if the water level drops.  
DanoM :How much did you spend before it was said and done?

thanks

rich
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