Jura Impressa E10 no coffee, no rinsing

Hello all.
My "old" Impressa E10 no longer works properly. No coffee and no rinsing possible. The following things have been done. Hoses renewed/BG revised/water pump with diaphragm valve renewed, drain valve revised. Turning wheel/piston of the brewing group had adjusted itself to position after revision.
Following procedure:
Switch on machine-> no rinse; device heats up; red cup lights up; rinse requested by me->rotary wheel of BG moves down->water pump hums briefly->drainage valve is actuated by machine and a little water is expelled there->rotary wheel moves back to home position->device requests switch to hot water-> Water comes out of the nozzle-> machine
heats up again until the red cup lights up
The


same happens when coffee is requested, only with coffee powder in the brewing chamberCould

it be that the piston fills the brewing chamber so much that there is no more room for water and then the BG moves to the home position due to the excess pressure?

In the cleaning program with tablet, the brew group works perfectly.