Nuova Simonelli Oscar leaking from expansion valve :(

#1: Post by **Bvlgaro** » November 9th, 2011, 4:16 pm

Thank you for your help, I will remove the question because I have posted it also on Coffee Geek.

#2: Post by **allon** » November 9th, 2011, 4:22 pm

Does this machine have an opv (distinct from the expansion valve)? Maybe it is stuck closed, leading to overpressure, and horrid espresso....

Give the opv a whack, and/or disassemble and clean it, if there is one.

November 9th, 2011, 5:04 pm

I cannot find in the parts list an OPV. Here is what I have:

#4: Post by **allon** » November 9th, 2011, 5:47 pm

Okay, now I'm at a place I can look at the diagrams...
Well, it appears that this machine has no way of really adjusting the brew pressure.

Here's a thread which may help...
Nuova Simonelli Oscar - how to lower the brew pressure?