Grinding mechanism without function

Hello together
I have a 2 year old Krups EA 8000 which ran without problems until now. The following error is now pending: When the preparation button is pressed, everything is normal except for the moment when the grinder switches on. This rotates at high speed without beans empty. So only hot water ends up in the cup. I disassembled the machine and cleaned it (scraped off deposits and blown it out with an air pistol). No defects or damages were recognizable. Maybe someone can help me.
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Thank you
Sebastian

Hello Sebastian,
I am new in the forum, but happen to know what the error is.
The grinder is defective due to a foreign body. Under the grinding cones, on the same shaft, there is a small plastic impeller. This impeller transports the ground coffee from the grinder to the brewing group. If the F-wheel has no more blades (due to foreign bodies), the grinding mechanism is clogged. I had that mistake, too. I removed the grinder and took it apart. The impeller had no more wings. I have reconstructed the defective part on CAD and had it printed out by 3-D printing.
Has worked well.
Sometimes you can get such a grinder at EBAY for a good price.
Good luck