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Nuova Simonelli Oscar no water indicator
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Wed Oct 16, 2013, 4:08pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

Is this the red wire at the boiler to disconnect?

udaman: ns oscar-30.jpg
(Click for larger image)
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Wed Oct 16, 2013, 4:09pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

Same wire from different view.

udaman: ns oscar-31.jpg
(Click for larger image)
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DanoM
Senior Member


Joined: 20 Mar 2013
Posts: 386
Location: Los Angeles
Expertise: I love coffee

Espresso: Bezzera Strega, '84 La...
Grinder: Compak K10, Kludge grinder,...
Posted Wed Oct 16, 2013, 4:33pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

That is the water level sensor connection. (Red wire in photos above.)
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Wed Oct 16, 2013, 8:06pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

Disconnect the red wire from the BLP and turn on.  I can hear the pump on but can't hear or know if the pump is pushing water into the boiler.  After about a minute, the no water lights comes on.  Tried this a few times with brew button on and off position.  Still no go.
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DanoM
Senior Member


Joined: 20 Mar 2013
Posts: 386
Location: Los Angeles
Expertise: I love coffee

Espresso: Bezzera Strega, '84 La...
Grinder: Compak K10, Kludge grinder,...
Posted Wed Oct 16, 2013, 11:36pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

I didn't see the warning in the thread so...  Word of caution: DISCONNECT THE HEATING COILS NOW

My NS Oscar was picked up used.  I knew it had some problem, but the guy who sold it really didn't know much and I knew nothing.

So the symptom was the system would show low water reservoir light and not pump water when you turned it on.  Even after trying all the normal stuff including shorting the water sensor the indicator always showed.  But one thing it would do even with the light on was heat up.  After 15 minutes it was getting warmer and if you started the group flow, even with the low water reservoir light on, water would flow and the low water light would turn off.  It was strange and quirky, but I was learning and accepted it...  Stupid mistake.

Anyway, I was using the machine off and on for a week like this until one day it stopped heating up.  The boiler had run low, the system turned on even though the boiler low triggered, and the heating coil exploded in failure.  My guess is the heater relay was frozen on, so as long as the pstat said it was below pressure the heater would kick in.  Also the water sensor was obviously dead.  So what should have been a $150 repair ended up costing an additional $60 for coil and seal.

Until you know your machine is working right and the water sensors are correct I would disconnect the heating coil.  If you fix it and all seems well then great, but it sounds like you are getting the intermittent failure mine had just with a little twist in the way it presents.
Here is the controller I purchased and is working great.  (No endorsement of the seller, just they were the best price I could find.)
http://www.espressoparts.com/S_230

Again, JBoyt might be able to repair this for 1/2 the cost of a new one.  Hear good things about his service.
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Thu Oct 17, 2013, 8:32am
Subject: Re: Nuova Simonelli Oscar no water indicator
 

I don't think the heating relay is stuck.  I left the Oscar on with the no water light for about 10 minutes at times and didn't feel any heat when disconnecting the water probe wires.  But good to know to watch out for.

Good price on the controller part replacement from Espresso Parts.  I was hoping there was a quick or cheap fix since I bought my Oscar used too.  I'll keep at it for while see if I'll get lucky.

Thanks for the link and suggestions.
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Fri Nov 22, 2013, 10:14am
Subject: Re: Nuova Simonelli Oscar no water indicator
 

Update, not so good.  

Purchas a new controller and replace the 'bad' one.  Got it working again and able to pulled one shot.  Turn it off and next morning the problem 'no water' light is back.  Went through all the previous troubleshooting steps as before but still no resolution.  Call Nuova tech and he suspect there might be a 'ground' problem.  He wasn't able to clearly explain how/where to check or it's me unable to understand what he's explaining.  

Can someone post pics of what cable/where I can check for a 'ground' problem?

thx.
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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 Sat Nov 23, 2013, 3:05am
Subject: Re: Nuova Simonelli Oscar no water indicator
 

yellow/green wire on frame under the copper line to the steam valve and top bolt to the group head
unclear how the boiler is grounded
               
                  brain
                                   white
    gray                        red
    black                       yellow/green


     red
     orange
     blue 2
     white
     brown 2 or red 2

2way

ensure 2way piston moves freely

clean blp
removing the red wire from the blp should have over filled the boiler and forced water out the steam valve I forgot to tell you to open
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udaman
Senior Member


Joined: 2 Oct 2008
Posts: 21
Location: Tx
Expertise: Just starting

Espresso: Nuova Oscar
Grinder: Mazzer Mini
Posted Mon Jan 13, 2014, 2:26pm
Subject: Re: Nuova Simonelli Oscar no water indicator
 

Got the OS back from the repair shop.  Tech replaced the 3-way solenoid and OS is working.  Thanks for all the input/suggestions.
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