securelpb Junior 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.
plindy Senior Member Joined: 27 Nov 2002 Posts: 73 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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