Krups EA 9000 error code 1

Hello,
My Krups EA 9000 does automatic maintenance right after I turn it on and then displays code 1 Call Service. I was in the two menus that are accessed by the shortcut keys. In the English one, Brewing function was red, so I bought a new brewing unit and installed it and lo and behold, still the same error message, Call Code 1 Sevice. Then I was in the French menu, have nothing understood, a bischen rumückt, language, date and time again reset and am back in the English menu, where now the Brewing function is green, but when switching on still comes code 1. This is to the hair wursteln.
Can someone tell me what I have to do, so that there finally comes out coffee again?