Hi brainstrust. - I have a problem which I can’t figure out
First I have already replaced the seal but it didn’t fix the problem
Machine - diadema junior extra - 10 years old or so
The problem: with filter basket full as normal, 15g basket in bottomless portafilter (18 months old), gets to pressure as normal then suddenly grounds blow out to the rear of the group head, leaving a hole in the very soggy puck. I assumed this was to do with the seal, so bought a new seal and .5 spacer and exactly the same thing happened.
Blind filter doesn’t leak and works as it should.
When removing blind filter there is no pressure left in the group, ie works as normal
Tried a finer grind with less grounds so I could turn the PF further - no change
I can’t see anything wrong with the filter or PF
I couldn’t remove the screw above the shower screen to clean it if that’s relevant
Any ideas?
First I have already replaced the seal but it didn’t fix the problem
Machine - diadema junior extra - 10 years old or so
The problem: with filter basket full as normal, 15g basket in bottomless portafilter (18 months old), gets to pressure as normal then suddenly grounds blow out to the rear of the group head, leaving a hole in the very soggy puck. I assumed this was to do with the seal, so bought a new seal and .5 spacer and exactly the same thing happened.
Blind filter doesn’t leak and works as it should.
When removing blind filter there is no pressure left in the group, ie works as normal
Tried a finer grind with less grounds so I could turn the PF further - no change
I can’t see anything wrong with the filter or PF
I couldn’t remove the screw above the shower screen to clean it if that’s relevant
Any ideas?

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