Thread: New Silvia not pulling shots

Hi all, I bought a new rancilio Silvia Yesterday and the first shot I pulling with it was pretty good, today I tried a slightly finer grind and not a drop of water cane through, I tried again with less tamping pressure and still no luck. I’m not experienced with the Silvia but is this normal if I don’t get the grind exact? Or do I have a problem with pressure?
Thank you