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Assuming that you scrubbed off all that crud from the shower screen until you could see through all the holes again. Did you take the distribution puck off as well as the shower screen? If you only descaled but didn't take the distribution puck off, there's a good chance a load of scale got flushed into the top of it and it's blocking it up, or blocking the hole that comes out the boiler into it. It'll be worth taking it off and inspecting. Check that hole isn't blocked anyway. You might need to poke it through with a needle, cocktail stick, small allen key etc.
Jonny69
@Light_EDDed
I descaled my gaggia classic yesterday and the crema has disappeared. The coffee tastes completely different. I have noticed that the time to complete the shot is slower so do I need to go finer on the grind?