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Simonelli Oscar with stuck reset button?
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Discussions > Espresso > Espresso Mods > Simonelli Oscar...  
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bendoc91
Senior Member


Joined: 2 Sep 2009
Posts: 30
Location: Israel
Expertise: I love coffee

Espresso: Nouva Simonelli Oscar
Grinder: Rancilio Rocky
Roaster: Oven
Posted Wed Aug 7, 2013, 1:44am
Subject: Simonelli Oscar with stuck reset button?
 

Hello,

I have a Simonelli Oscar that's really underused. I've moved abroad and couldn't take it with me so I only take her out 3-4 times a year. It's been a few months since last time

This time I turned it on, everything was fine until a few days ago the steam became weak and the heating element wouldn't turn on. I let the machine cool down completely and the element still wouldn't go on. The machine wasn't heating up and the LED indicating that it was heating was off

I read here something about a red reset button on the side of the boiler so I set out looking for it. I wiggled it around a bit, and oh-glory the machine came back to life. Problem is that it only worked for about a day.
Now I played with the button a bit more but it's not helping. If I push it down manually (I know I should be hit on the nose with a newspaper for sticking my hand in a plugged in machine) the element turns on, but when I let go it turns off again. I've set the Pstat to a very high temp, and it's relatively new so I doubt this is the problem.

Has anyone ever encountered anything like this? What can I do to have some decent coffee before leaving home?

Thanks,

Ben
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DanoM
Senior Member


Joined: 20 Mar 2013
Posts: 358
Location: Los Angeles
Expertise: I love coffee

Espresso: Bezzera Strega, '84 La...
Grinder: Compak K10, Kludge grinder,...
Posted Wed Aug 7, 2013, 6:58am
Subject: Re: Simonelli Oscar with stuck reset button?
 

I think that 'red reset button' is a thermal fuse on the boiler.  That can trigger if the boiler scale builds up too thick, or it can be that the reset button just needs to be replaced.

Do you have hard water that's being used for the espresso machine?  If so the boiler likely needs descaling.  There are instructions around on this site and related youtube videos that should help you with that.

If the boiler appears clean then you might look at getting a replacement thermal fuse reset button.  They can, and do, fail from time to time.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,745
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 Aug 7, 2013, 8:15am
Subject: Re: Simonelli Oscar with stuck reset button?
 

It is the over temp safety switch, I find it hard to make a connection with scale but I suppose it is possible. It is a mechanical switch and it sounds like the plastic inside the switch has a broken latch.

The pstat may need adjusting or replacing. You do not have a gauge on the machine so you have no indication of pressure in the boiler.

With heat and time, plastic can fail, so things may be OK in the machine but you do need to make sure.

I would NEVER tell anyone to do the following. I did it ONE time while waiting for a new switch to come in the mail, if there is no safety relief valve this can be very dangerous, the boiler can blow up, you may DIE! do not do it. I jumped the two wires so that they made a connection while waiting for my part to come in the mail on a different machine that does have pressure gauges so I could look and watch what the pressure was.

A new switch for your machine should only be a few dollars and it needs to be replaced, You also need to check for proper operation of the Pstat. All in all though, it is just likely that the switch is old and needs replacement.

 
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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bendoc91
Senior Member


Joined: 2 Sep 2009
Posts: 30
Location: Israel
Expertise: I love coffee

Espresso: Nouva Simonelli Oscar
Grinder: Rancilio Rocky
Roaster: Oven
Posted Wed Aug 7, 2013, 8:50am
Subject: Re: Simonelli Oscar with stuck reset button?
 

Hello,

Thanks for the response.

I haven't descaled the machine in a very long time.
I just did it. I used a 50% distilled vinegar solution. Did two runs and on the second run the water still came out pretty blue. I didn't let the machine stand with the vinegar for more than ten minutes.
The fuse is still stuck.
Should I do a third one? Maybe let the machine stand with the vinegar solution for a while? Or just cut my losses and go look for a fuse?
Finding spare parts is a pain here. The importer told me that he won't sell me parts "for my own good" as I could damage the machine, and some guy who runs a coffee machine store asked for about triple what Simonelli asks for.

Calblasmith, I'm not trying to go around it, I just wanted to diagnose the problem and descale. The Oscar does have an OPV which lets out a little water that drips into the machine and makes it short circuit. Unfortunately I've seen this in the past.
My Pstat is less than a year old, I replaced it because the old one was leaky. If I understand properly this switch is what makes the familiar 'click' sound when the heating element shuts off. If so, the problem is only that it doesn't came back into place. The element shuts off at the correct temp, but it doesn't turn back on when the machine starts cooling

Thanks,

Ben
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,745
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 Aug 7, 2013, 11:45am
Subject: Re: Simonelli Oscar with stuck reset button?
 

The Pstat is a pressure operated switch, yes it clicks every time it turns on and every time it turns off.

For descaling, most use citiric acid or a commercial descaling solution.

So, now I am confused (more than normal) is it the Pstat or the over temp safety switch that you are holding? The Pstat is the box you replaced. The over temp safety switch has a red button in the center and is a little smaller than a dime around.

 
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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bendoc91
Senior Member


Joined: 2 Sep 2009
Posts: 30
Location: Israel
Expertise: I love coffee

Espresso: Nouva Simonelli Oscar
Grinder: Rancilio Rocky
Roaster: Oven
Posted Wed Aug 7, 2013, 12:07pm
Subject: Re: Simonelli Oscar with stuck reset button?
 

It's the over temp that I'm holding. I just push it in until it clicks and then when the pstat clicks it jumps out and the boiler turns off. At this point the water that comes out of the grouphead is around 70C so it's not overheating.
I don't hold the switch, I just press on it towards the boiler until it clicks and let it go
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,745
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 Aug 7, 2013, 2:17pm
Subject: Re: Simonelli Oscar with stuck reset button?
 

So just replace the OT switch and reset the Pstat and all should be  fine.
You don't need to go to NS for parts, there are lots of them out there.

 
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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