Miele CVA message: Insert drip tray

Hi all!
I have a Miele CVA 7845 coffee machine.
The machine was working great, 2 weeks ago it stopped in the middle of the cup and displayed brewing unit error.
I replaced both the drive unit and the brewing unit (the brewing unit was not faulty though). The error code has disappeared and was not displayed in the service menu.

When I start the machine, the message appears: empty and insert drip tray and grounds container.
Both contacts and container are clinically cleaned. The machine displays the same error regardless of whether the container is in the machine or not.
Both the contacts in the machine and on the container are cleaned, there is no water, dirt or leaks in the machine. When I measure the contacts with the machine switched on, they show about 28 V when idling and about 40 V when the contacts are pressed. As I said, the machine does not show any error codes in the service menu.

Does anyone have any ideas?

Incorrect contact to the assembly?
Connection cable to the assembly?
Motor damage to the 12-24 control valve?

Hello, I think there was a similar problem with the Melitta Bistro KVAs. Two electrolytic capacitors were usually the main culprit there.
Perhaps this will bring you closer to a solution.

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QUOTE (kaffeechris @ Sunday, February 18, 2024, 8:01 pm)

Hi, I think there was a similar problem with the Melitta Bistro KVAs. Two electrolytic capacitors were usually the main culprit there. The inner workings of these two KVAs are probably very identical. Perhaps this will bring you closer to the solution.

Thanks for your reply. I did some more troubleshooting and the 12-24 control valve is also defective.
After disassembling, I find the model designation rs-545sh-18150 on the motor, which seems to be a normal DC-DC. Miele want 430 euros for it, but in my opinion the motor is at fault and not the valve itself. On eBay, for example, you can find this

https://www.ebay.de/itm/354241132844?itmmeta=01HQ0XKQQ4089XZP5G9KN0P54D&hash=item527a6ab92c:g:7x0AAOSwQ0VgmiTS&itmprp=enc%3AAQAIAAAawMU%2BTebSUl6AKuQNcPx7ofGeEs8y79r lAZkP5Jutto qZ9YtEU4kwJ4si3pyioduFsD75ODSVJ2rAubLYTXz5wYTMENSvRrkQXrUA%2BAM5lYTA4I%2F2O%2B80CO2tZcUNZH9KeBRZpvy22HmCza%2BztAFsKZ86LairZD2qTselTRqw2kYfb61RPMd6%2F 7dNWJ4RNCJ4P1RZlSfEB WeSxPHvrv%2FAoP%2Bvde9K2GNlW880c6AbNtkl1HAuo6u%2FPLqCQ%2BFdX %2BpsFw %3D%3D%7Ctkp%3ABk9SR9T7zp24Yw

Does anyone know, if the motor can be replaced by the one mentioned above? However, it says 12-30 V, but the model is identical. There is a number under the model name itself that starts with QD. All motors start with QD, but the numbers are different. Does each individual motor have a specific specification or is it e.g. serial number?

Thanks for any answers,