I'm having the hardest time figuring out what is wrong with my Rialto 4500. One day i was making a long shot of espresso and it came out unbelievably sour (not bitter, just a nasty sour taste). I suspect it was the beans, they were smelling a little off so I threw them out and cleaned the parts inside the machine, descaled the machine, ran the machine through a couple of times to clear out whatever residue was inside and my coffee still comes out with a slight sourness to it that completely ruins the usually delicious coffee it makes.
I can't seem to find a solution online to get rid of this taste, anyone have any similar experiences? It's an expensive machine that has been rendered useless :(
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