Coffee does not run through

Moin together,

have since a few weeks a problem with my Siemens EQ7 Plus. The coffee no longer runs through. Beans are ground normally, the process also starts normally. But then breaks off and it comes out only hot steam on the side. No errors are displayed. Grind is so far dry.
Yesterday I changed the ceramic valve, unfortunately the error remains.
Can this possibly be brewing unit?

For the remedy I thank you in advance

Hello,
I have exactly the same problem.
I have dismantled everything, cleaned everything and nothing.
When I start a coffee, everything is normal until the moment when the KF must flow through the small nozzles (sometimes the equivalent of 1/4 cup or sometimes nothing followed by a big depression on the side with steam).
Have you found the solution?
Thanks for your help.

Exactly the same problem, the machine has been in use for 3 days and the coffee does not flow even though it is well ground. When I restart the machine the coffee flows again until the problem starts again...there is a lot of water in the drip tray even though I always put a glass in front of it! and the ground coffee is not well rounded! I sent the machine back to maxicoffee who offered me an exchange for another new machine. What do you think about it?