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Oscar Nuevo Simonelli Pump Won't Fill Boiler
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securelpb
Senior Member


Joined: 26 May 2014
Posts: 1
Location: Salt Lake City, UT
Expertise: Just starting

Posted Mon May 26, 2014, 8:29am
Subject: Oscar Nuevo Simonelli Pump Won't Fill Boiler
 

For the past few months my Oscar has been acting strange. When it needs to fill the boiler sometimes the pump doesn't kick on. Instead of making the normal sound it makes a humming sound (maybe you would call it a buzzing sound). I thought it might be the pump, but this is where it gets interesting. If I catching while it is buzzing and quickly tap the brew button on and off the pump kicks on and fills the boiler.

The pump never misses a beat when brewing, so I think the pump is solid. However, I'm at a complete loss as to what is wrong.

Thanks
Alex
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plindy
Senior Member
plindy
Joined: 27 Nov 2002
Posts: 74
Location: Seattle
Expertise: Just starting

Espresso: NS Oscar
Grinder: SJ Pharos Lido HG-One
Posted Tue May 27, 2014, 12:25am
Subject: Re: Oscar Nuevo Simonelli Pump Won't Fill Boiler
 

2 way solenoid  could be partially blocked , and the internal piston opens only intermittently  
4th click to enlarge
disassemble and confirm free movement of piston , and clear internal passages of the 2 way
also the boiler fill probe should be clean , 1st click to enlarge

so is the buzzing  sound low left , or higher up on the left ?
either way the next concern will be the brain or gicar controller failing or at least going interment  
hopefully the 2 way has a build up of scale  on the piston or the ID of the body that can easily be cleaned with white vinegar , compressed air , or a combination of the two
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