No water output via brew group

Hello all,

I turn to you because my Siemens automatic coffee machine no longer lets out water through the brew group.
I am a technician for white goods. Am therefore part in the topic.

Siemens TE501501DE/10 of 2015Initial situation

:
The machine builds up pressure. But does not get rid of it after a few seconds and then releases it via the expansion chamber.


Testedand replaced:
Water comes out through the pump, heater, 2-way valve
.

Then through the connection brew group it goes no further.
Then I ordered the drain valve new and exchanged.
Result is the same.
When I take the brew group out and blow into a hose that I put on the brew group, the drain valve only lets air to the brew screen, in a very specific position. Just before the end position of the brew group. So now when I turn the brew group to the end as the motor of the brew group does, the drain valve seals again.

Can and must I adjust something on the brew group?
Or does the motor need to stop sooner?
I am a little at the end and also do not want to wildly exchange parts.

Dear greetingsSascha

Case solvedCremaventil
in the brew group sat tight
.