I've been getting a steam/pressure release noise from my porta filter after I shut down a shot. As if it ran out of water or something. Water level is fine, and shot is ok. But I did not get this noise before. Maybe the shot grind is too tight? I'll try today but am limited to trying too many times. Short on beans.
I can't quite tell from the description, but 3 way discharging, or 3 way not functioning properly. If the pucks are relatively dry and you can release the PF just after the shot, the 3 way is probably working normally. Are you perhaps hearing that? I can hear mine sometimes more than others, on a Gaggia.
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