Hello I do not speak German (answers may be in German or English),

I have the delonghi ECAM24.455.M
I have had a problem with the finely ground beans. New pump, flow meter, pressure regulator + cleaning the zetgroup bottom and top like here https://www.youtube.com/watch?v=zHf7mvwke0c&t=8s
After this I can make coffee again. (rinsing works too) But I can no longer use hot water. Will be needed for descaling.
What could be the problem? Magnetic switch (3 in machine)
The water from the pump first goes to the boiler than "Brühkolben" but where does water have to end up at the "Brühkolben" for hot water? Please send a photo with an answer.
I do not think it's a descaling problem. Black plastic air hose is clean. Two magnetic switches click to the side in test modes. Heating element normally comes warm.

Thank you for reading