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Discussions > Espresso > Espresso Mods > Help with Oscar  
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overlandsea
Senior Member


Joined: 10 Jan 2012
Posts: 10
Location: Seattle
Expertise: Just starting

Posted Tue Jan 10, 2012, 7:52am
Subject: Help with Oscar
 

Hi all. I am new to the world of home espresso (well at least good home espresso). Recently picked up a used Nuova Simonelli Oscar, but it is giving me some grief! Worked great, but yesterday it made a strange chemically smell (kind of like burning rubber). Now today it would only partially heat up. The heat light went out way too early (no steam, warm, but not hot coming out of brew head). Any ideas of the issue? (Yes, I do bleed out extra 'false' steam pressure during warm up, but it didn't help today). I'm mechanically inclined, but do not know a ton about espresso machines.

Thanks!!
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,949
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Jan 10, 2012, 8:00am
Subject: Re: Help with Oscar
 

They are fairly simple machines really.
A heater a thermo regulating system and some plumbing and a pump.
I was going to advise false pressure but it sounds like yoi are goong to need to open the machine up and do some troubleshooting.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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overlandsea
Senior Member


Joined: 10 Jan 2012
Posts: 10
Location: Seattle
Expertise: Just starting

Posted Tue Jan 10, 2012, 9:10am
Subject: Re: Help with Oscar
 

fair enough.

any likely suspects where I should start? the machine does power on and it filled the boiler on start up as usual.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,949
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Tue Jan 10, 2012, 9:46am
Subject: Re: Help with Oscar
 

With the chem smell, I'm guessing wire issues and the heater would be where I would start. You also said that it wasn't heating properly which also points to the heater circuit ir its controls.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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overlandsea
Senior Member


Joined: 10 Jan 2012
Posts: 10
Location: Seattle
Expertise: Just starting

Posted Wed Jan 11, 2012, 10:23am
Subject: Re: Help with Oscar
 

I opened it up and found that the connection to the lower terminal on what I believe is the over-temp switch had fried (explains burning rubber smell...actually melting plastic). I'm guessing that there was a short of some kind. Does anyone have any idea what might have caused this? When I tried pulling the melted connection off, the wire instantly broke away. I was able to put a new connection from Radio Shack on and the machine now works great.

Any ideas on causation? I'm happy it works, but I'd like to keep it from happening again. I descaled and backflushed the machine the day before this happened...not sure if that could have contributed in any way.

I can post pictures later if that helps.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,949
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Jan 11, 2012, 10:40am
Subject: Re: Help with Oscar
 

You may never know just what the exact cause was, it might have been some water splashed around inside the machine or it may have been a bad connection from the factory that just decided to let go.

I guessed to myself that if you opened the machine, based on the issues, that the problem would be on the easy side to find, burning wires and connectors tend to look, well, burnt LOL!

Congrats on the repair, that is a good machine and he should serve you well for a long time.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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Discussions > Espresso > Espresso Mods > Help with Oscar  
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