Hi guys
I am test driving my secondhand 2015 la marzocco PB 2 groups at home before my café open, but found a problem, had bleed the machine, and change the bar pressure to try fix it, but no luck, the problem is when I pour the water with no coffee in the group on group 1 the bar will drop from 12 to 8 but when I pour the water with 2 groups together the bar drop to 3, I had check with different la marzocco 2 groups it's should be not lower than 8 bar when both groups pouring water, I tried to give more pressure by adjust the rotary, but still drop around 3 bars when both groups pouring, any ideas?
When both groups have coffee inside, they seems running OK with 9 bars.
Sorry for my English, it's wasn't my mother language, if I didn't described clear enough please check the video below, thanks.
https://youtu.be/31dGlGBYOkU
I am test driving my secondhand 2015 la marzocco PB 2 groups at home before my café open, but found a problem, had bleed the machine, and change the bar pressure to try fix it, but no luck, the problem is when I pour the water with no coffee in the group on group 1 the bar will drop from 12 to 8 but when I pour the water with 2 groups together the bar drop to 3, I had check with different la marzocco 2 groups it's should be not lower than 8 bar when both groups pouring water, I tried to give more pressure by adjust the rotary, but still drop around 3 bars when both groups pouring, any ideas?
When both groups have coffee inside, they seems running OK with 9 bars.
Sorry for my English, it's wasn't my mother language, if I didn't described clear enough please check the video below, thanks.
https://youtu.be/31dGlGBYOkU

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