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Date: 09 Sep 2007 07:39:27
From: glepore
Subject: help troubleshoot oscar water sensor
The "tank empty" sensor on my Oscar is malfunctioning. I have water,
will pump, but it constantly trips and shuts down the machine. Jumping
it out with a jumper wire doesn't help. Can anyone shed any light on
its operation and how to bypass/ repair, or is this a brain issue?





 
Date: 11 Sep 2007 13:51:06
From: glepore
Subject: Re: help troubleshoot oscar water sensor
On Sep 11, 12:10 am, "Jack Denver" <nunuv...@netscape.net > wrote:
> looks like jumpering 5 to 10 would cut the brainbox out of the heating
> circuit.
>
> If boiler autofill is also flakey too this is a prob - without a sight glass
> you have no clue as to the boiler fill unless the autofill sensor is
> working.
>
>

Jack, when the 'no water" circuit trips, it also cuts out the vibe
pump, so essentially you'd need to bypass all of the brain functions.



 
Date: 10 Sep 2007 17:27:43
From: glepore
Subject: Re: help troubleshoot oscar water sensor
On Sep 10, 7:35 pm, Paul Smith <p...@test.com > wrote:
> From my personal experience, Oscar=B4s water sensor operates on a sort of
> Voodoo basis -

Paul- my tank is full, and everything will pump, until the brain says
"no water" and cuts power to heat and pump.

I agree that the sensor is a pain, even when its working.



  
Date: 11 Sep 2007 03:55:56
From: Paul Smith
Subject: Re: help troubleshoot oscar water sensor
On 2007-09-11 02:27:43 +0200, glepore <glepore@comcast.net > said:

> Paul- my tank is full, and everything will pump, until the brain says
> "no water" and cuts power to heat and pump.
>
> I agree that the sensor is a pain, even when its working.

Sorry , iīve obviously misunderstood the problem.

In case you havenīt been there already, Simonelli has a few schematic
PDFs here:
http://www.nuovasimonelli.it/espressocoffeemachines/view.aspx?Action=link&Id=6447





   
Date: 11 Sep 2007 00:10:04
From: Jack Denver
Subject: Re: help troubleshoot oscar water sensor
looks like jumpering 5 to 10 would cut the brainbox out of the heating
circuit.

If boiler autofill is also flakey too this is a prob - without a sight glass
you have no clue as to the boiler fill unless the autofill sensor is
working.


"Paul Smith" <ps@test.com > wrote in message
news:2007091103555675249-ps@testcom...
> On 2007-09-11 02:27:43 +0200, glepore <glepore@comcast.net> said:
>
>> Paul- my tank is full, and everything will pump, until the brain says
>> "no water" and cuts power to heat and pump.
>>
>> I agree that the sensor is a pain, even when its working.
>
> Sorry , iīve obviously misunderstood the problem.
>
> In case you havenīt been there already, Simonelli has a few schematic PDFs
> here:
> http://www.nuovasimonelli.it/espressocoffeemachines/view.aspx?Action=link&Id=6447
>
>
>
>




 
Date: 10 Sep 2007 15:24:18
From: glepore
Subject: Re: help troubleshoot oscar water sensor
On Sep 10, 5:20 pm, "Jack Denver" <nunuv...@netscape.net > wrote:
> This is sounding more and more like a brain box prob if it is heat related.
> IIRC, the internal transformer is the part that goes bad the most. If you
> don't want to spring for a new box or repair you could hotwire the power to
> the heating element so it bypasses the brainbox (jumper across power in to
> box / out to heat circuit).
>
> "glepore" <glep...@comcast.net> wrote in message
>
> news:1189452872.998511.8880@y42g2000hsy.googlegroups.com...
>
>
>
> > On Sep 10, 11:06 am, "Jack Denver" <nunuv...@netscape.net> wrote:
> >> RU sure you have properly jumpered the sensor wires? Check for continuity
> >> at
> >> the brainbox (possible breaks in sensor wires?), or jumper right across
> >> the
> >> brain terminals.
> > Thanks Jack. I did just jumper at the terminal ends at the tank
> > socket.I'll try it at the box. Seems to be heat related,
> > unfortunately, only occurs with a warm to full temp boiler.- Hide quoted text -
>
> - Show quoted text -

Excellent idea for a short term fix, should have thought of that
myself. I'll also need to do something to manually fill boiler as well
tho.Jump power to boiler fill with a switch? Do you recall if wiring
schematics are on the NS site?



  
Date: 11 Sep 2007 01:35:32
From: Paul Smith
Subject: Re: help troubleshoot oscar water sensor
From my personal experience, Oscarīs water sensor operates on a sort of
Voodoo basis - it can either take a few seconds or up to 20 minutes
until it actually senses that thereīs water in the tank again,
regardless of any trick i might use. Iīd simply try to prevent that the
tank runs empty and wouldnīt worry too much about possible hardware
issues...



 
Date: 10 Sep 2007 12:34:32
From: glepore
Subject: Re: help troubleshoot oscar water sensor
On Sep 10, 11:06 am, "Jack Denver" <nunuv...@netscape.net > wrote:
> RU sure you have properly jumpered the sensor wires? Check for continuity at
> the brainbox (possible breaks in sensor wires?), or jumper right across the
> brain terminals.
Thanks Jack. I did just jumper at the terminal ends at the tank
socket.I'll try it at the box. Seems to be heat related,
unfortunately, only occurs with a warm to full temp boiler.



  
Date: 10 Sep 2007 17:20:19
From: Jack Denver
Subject: Re: help troubleshoot oscar water sensor
This is sounding more and more like a brain box prob if it is heat related.
IIRC, the internal transformer is the part that goes bad the most. If you
don't want to spring for a new box or repair you could hotwire the power to
the heating element so it bypasses the brainbox (jumper across power in to
box / out to heat circuit).


"glepore" <glepore@comcast.net > wrote in message
news:1189452872.998511.8880@y42g2000hsy.googlegroups.com...
> On Sep 10, 11:06 am, "Jack Denver" <nunuv...@netscape.net> wrote:
>> RU sure you have properly jumpered the sensor wires? Check for continuity
>> at
>> the brainbox (possible breaks in sensor wires?), or jumper right across
>> the
>> brain terminals.
> Thanks Jack. I did just jumper at the terminal ends at the tank
> socket.I'll try it at the box. Seems to be heat related,
> unfortunately, only occurs with a warm to full temp boiler.
>
>




 
Date: 10 Sep 2007 11:06:57
From: Jack Denver
Subject: Re: help troubleshoot oscar water sensor
RU sure you have properly jumpered the sensor wires? Check for continuity at
the brainbox (possible breaks in sensor wires?), or jumper right across the
brain terminals. If full continuity doesn't send the "tank full" message
to the box, then something is wrong inside the box.



"glepore" <glepore@comcast.net > wrote in message
news:1189348767.261570.84060@r29g2000hsg.googlegroups.com...
> The "tank empty" sensor on my Oscar is malfunctioning. I have water,
> will pump, but it constantly trips and shuts down the machine. Jumping
> it out with a jumper wire doesn't help. Can anyone shed any light on
> its operation and how to bypass/ repair, or is this a brain issue?
>
>




 
Date: 09 Sep 2007 12:00:16
From:
Subject: Re: help troubleshoot oscar water sensor
On Sep 9, 4:39 pm, glepore <glep...@comcast.net > wrote:
> The "tank empty" sensor on my Oscar is malfunctioning. I have water,
> will pump, but it constantly trips and shuts down the machine. Jumping
> it out with a jumper wire doesn't help. Can anyone shed any light on
> its operation and how to bypass/ repair, or is this a brain issue?

I've heard that distilled water will lead to these symptoms, since it
will not conduct enough electricity to close the circuit. But if
jumping doesn't help then it's probably not a water issue. My only
other suggestion would be to wait a day or 2 to let the brain dry out,
then try again ...