WMF 800 Flow stopped

Have a good day, I hope somebody can help me out here.
My WMF 800 is spinning since the first coffee was bought this morning. The machine started normally and the first coffee was as usual. In the second attempt, the mill started up normally and the brewing process also started as usual. After a few seconds you suddenly heard how the (I suppose pump) built up a rising pressure, then about 80ml ran into the cup and the brewing process was finished.
A coffee was drawn again and during the grinding process the machine suddenly stopped with the error message "Coffee powder too fine". I have to say that the grinding degree has not been changed for a good year. Only the type of coffee is new. When the next reference attempt was made, everything started again as usual, up to the point at which the pressure audibly changed and was finally blown off via the drip tray. The display will then show the error message "Flow stopped" again. Brewing unit was cleaned manually by me. Automatic machine cleaning also ends with the above "flow stopped" problem.
Since then the machine is stuck in the cleaning program.

Hello guest,
had the same problem fixing. But then you have to disassemble the machine.
And that was a blockage of "coffee dust" from the outlet of the brewing group onwards>Tip: take the outgoing pipes and distributors apart and clean them. Even turned a drill by hand back then. Water ran out next to the brewing group at that time.

Many success with screwing... Greetings Edgar

Okay, thanks for the answer. Then I'll try my luck.

Hello,
that's not luck but work properly.
The success coffee is ok again.

Greetings Edgar