Krups EA 8245 error code 14

Hello Community,

briefly the prehistory. I have disassembled the device according to instructions because the grinder "hung". I then disassembled a little further to roughly clean or vacuum out the machine. I continued to replace the brewing piston seals, so the machine ran again. However, I found the coffee to be a bit weak and watery, which I came across a guide for the amount of coffee powder.
I set that to level 3 in the menu (what is the factory setting, anyway?) and then a French menu came up. Google Lens helped me translate it. The machine recalibrated itself and finally came the message error code 14. what does that mean?
The machine runs, also the coffee goes in my opinion again (or still a bit weak?). With the double cycle, it goes into automatic maintenance after the first cycle and aborts the second cycle.
What could be this?

Thanks for your help,
Love Patrick

So, have now registered times.

Update on the machine:

It leaks somewhere (coffee). Will probably have to disassemble it again. Anyone have any ideas what this could be?