Originally posted by FineGrind
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You'll find that it's not going to go much past 9.5 bar. There's an OPV inside your machine which bleeds excess water pressure.
1.2~1.3 bar on the other gauge sounds about right. It'll drop once you open up the steam wand, but this refers to the pressure in the boiler.
Watch the videos here for a general overview of everything - the cleaning and maintenance will explain the whole concept of backflushing.
How to Make Coffee - Coffee Machine Steam Grinders Makers Commercial Domestic Italian Automatic

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