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Nuova Simonelli "Oscar" with weird cycling problem.
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JohnMacK
Senior Member


Joined: 26 Nov 2008
Posts: 3
Location: Burnaby BC
Expertise: I love coffee

Posted Wed Jul 3, 2013, 7:42pm
Subject: Nuova Simonelli "Oscar" with weird cycling problem.
 

I think this is my first post here, but I have been visiting the site and forums for years as my source for qualified opinions on everything Espresso.
Now my Nuovo Simonelli "Oscar" is acting up and I could really use some directed help as to what the most likely culprit is. At the initial warmup and after removing the false pressure via the steam valve, I found the heating element shutting off too early to develop real steam. The water is not getting as hot as it should as well. I heard a clicking which reminded me of relay contacts, and the heating element light would cycle on an off quickly in time with the noise. My espresso hardware diagnosis and repair skills are extremely weak, but I wondered if this might be the pstat contacts and indeed I can feel the vibration through the body of the Sirai. I thought of what I've read here, and two things that came to mind were the contacts of the pstat  and the membrane - since there seems to be a repair kit available for that part. I removed the Sirai from the boiler, and after checking the contacts they were worn pitted and on a bit of an angle if that makes any sense. There was very little calcification on the brass body holding the membrane/piston, but I cleaned that up. I moved the wiring from the first set of contacts to the third set, and I'm about to reassemble. Before I do - was wondering if anyone has had a similar heater/pstat cycling like I did, and whether this problem IS likely to be caused by the Sirai or something else entirely. I'm ashamed to admit this but I currently have no means of gauging boiler pressure nor temperature, but I intend to remedy this shortly with a wand mounted gauge, and a PF temp gauge once i find a good article here for part source and methodology. This site has proven to be invaluable to me for picking an espresso machine and learning how to brew good shots. Now I'm hoping for some help in getting properly caffeinated  once more (no backup machine).

This is not the worst example but shows the cycling I mention.     http://youtu.be/lYNBwtAToag
Thanks for any help/advice any of you may have.
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plindy
Senior Member
plindy
Joined: 27 Nov 2002
Posts: 75
Location: Seattle
Expertise: Just starting

Espresso: NS Oscar
Grinder: SJ Pharos Lido HG-One
Posted Tue Jul 9, 2013, 1:51am
Subject: Re: Nuova Simonelli "Oscar" with weird cycling problem.
 

plindy Said:

look for corroded wires on the left side of the machine ; thermostat or high limit switch , push red button in to reset , boiler wire connections , wire to the power switch , also check connecters inside the Pstat
If you have a later machine the thermostat is on the boiler element and somewhat more involved to change

Gluck

Posted July 9, 2013 link

any news ?
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JohnMacK
Senior Member


Joined: 26 Nov 2008
Posts: 3
Location: Burnaby BC
Expertise: I love coffee

Posted Tue Jul 9, 2013, 4:23pm
Subject: Re: Nuova Simonelli "Oscar" with weird cycling problem.
 

Thanks for the suggestions - I'm grateful, and the boiler wiring suggestion is spot-on! As it turns out my boiler water level probe had crept out higher and higher and the boiler was overfilling. Like I mentioned my diag skills are so weak I hadn't noticed this, and I don't normally open appliances, even one's this essential. I took it into ECM (Espresso Coffee Machines) since I live in Burnaby BC, and they popped the top for a look see while I waited. They spotted the elevated probe and had things fixed and tested before I knew it.

So as you mentioned it was the boiler wire (technically), and I am back to some delicious shots with a bit more espresso knowledge in me head. Now I'd like to get "guaged up" and see if there can be even better elixir from my resurrected Oscar. Also would like to become versed in "the water dance", flushing, and maybe even a mod or two if I get adventurous.

Thanks for the helpful suggestions. I enjoyed your modification video with the descale, boiler insulation, group head restricters, and steam valve replacement. I'll need to get a lot more reading under my belt before I attempt anything that advanced.
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lukeap69
Senior Member


Joined: 15 Mar 2013
Posts: 17
Location: Dubai
Expertise: I love coffee

Espresso: Nuova Simonelli Musica Lux
Grinder: Nuova Simonelli MDX
Posted Tue Jul 9, 2013, 4:53pm
Subject: Re: Nuova Simonelli "Oscar" with weird cycling problem.
 

John

This may interest you http://www.elektros.it/en/tips-and-tricks.html

Arnold
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JohnMacK
Senior Member


Joined: 26 Nov 2008
Posts: 3
Location: Burnaby BC
Expertise: I love coffee

Posted Tue Jul 9, 2013, 5:49pm
Subject: Re: Nuova Simonelli "Oscar" with weird cycling problem.
 

Thanks Arnold! That's pretty good that the first trouble shooting tip was for exactly my trouble. I'm going to save some of this information in case the links go dead at some point.
Enjoying an early evening double shot again!  Ahhhh...

"This may interest you http://www.elektros.it/en/tips-and-tricks.html

Arnold"
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