Krups EA829810/70M

I have the following problem after replacing the electronics board and changing the piston rings on the brewing unit.
The machine can be switched on, the input of the time works, then the preheating starts. Maintenance starts and hot water also comes out of the steam pipe briefly, and maintenance continues until the error with the coffee grounds container.
Then the machine constantly wants me to empty and reinsert the coffee grounds container and drip tray. The limit switch of the residual container is OK and switches (I have measured). Then comes briefly the message "Will be set" and it runs for about 7 sec a motor in the front right of the housing.
After that comes again Kafferestbehälter empty and reinsert. This game goes on without a break. Sometimes there is also the question whether the container is empty and in. Answered with yes and again the same error,
even after switching off and restarting the machine.
I am at a loss and would need some help or a tip on troubleshooting.

Thanks//

www.kaffeevollautomaten.org/kaffeemaschinen/krups/1227_espresseria_automatic_ea_/]Krups Espresseria Automatic EA 8298[/URL]