I have a Gaggia TS that stopped making shots after not being used for a month (I was on vacation). I can pull a shot, but it takes so long (well over a minute) that I finally give up.
The pressure gage still shows the same reading as it always has (10 bar); I bleed off the steam out of the brew head before pulling the shot, just as before; the hot water still comes out of the brew head the same as before; the coffee is exactly the same (Lavazza Dek Decaf). However, it is a new batch of coffee that I obtained. I have dialed back on the grinder from a 12 to 10 (Baratza Virtuoso Preciso) to no affect. When I knock the coffee into the box, it is only partially wet. I can make steam and foam milk perfectly.
I checked the porta filter and the two exits are not blocked; I pulled the screen off the bottom where the water comes out of the machine and it isn't gunked up at all.
Has the coffee changed that much that I need to really dial back the grind? I can't figure out what else it would be.
I can't think of anything that requires less effort to check, let alone fix, than adjusting the grind. So try that befpre you start with things that require taking the machine apart. But I didn't have to say that, did I? Another day without caffeine and you would have come to the conclusion, on your own, that just because the bag looks the same does not mean the beans are, in fact, the same :)
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