I have a 2 year old Gaggia Classic. It has been superb until recently, when I noticed that the water comes out of the screen not a s spray, but as a single stream, originating sometimes at the centre, and sometimes offset from the centre. The screen used to have a nice even "spray". Crema is feeble. I have descaled several times, and changed the screen to the steel and mesh one from Happy Donkey.
I took the screen off, and the holder behind. There is a single hole from the boiler. 4 equal streams come from the holder (screen left off), but when I put the screen back on - no even spray across the surface of the screen - just one or two streams.
Thanks. You are right, I used to see the even spread of water from the dispersion screen as shown in the Gaggia video. Now it looks more like the cooling flush video. If my coffee production has slipped away, I was unsure if it might have been because of that, or my own ineptness.
I am not sure if you resolved this issue. If not, try checking your flow. The pump should flow about 10 ml/sec with no pressure against it, so run for a rew seconds and make sure that you are close to normal. This would be with the PF off, measure flow out the group.
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