EA8025 Error code 5: Fill. Water circuit necessary

Hey KVA-Forum, I hope you can help me...

After having successfully eliminated 2 error codes, I am now faced with the following puzzle:When switching on, the following happens:1. Autotest is started2. Message "Water circuit filling required" 3. Please confirm and provide 600ml4. Approx. 50 ml of water is sprayed from the water nozzle and approx. 10-20 ml ends up in the collecting tray5. Autotest is restarted6. Message "Filling of water circuit necessary" 7. Please confirm and provide 600ml8. Water nozzle sprays approx. 50 ml of water and approx. 10-20 ml ends up in the drip tray9, Please contact customer service: Error code 05I don't get it. I already blew through the flowmeter and checked everything so far and looks good... Could it be an electrical fault?! Maybe the circuit board got one once... I have also run the service program once and it actually behaves exactly the same as with my functioning machine.... With "Pump -> Lower hydraulics" it also hangs up...
HELP! HELP!

Solved...it was a shaky red cable from the three at the flowmeter!!! Machine
is running!