EQ.6 plus S300 popping after switching on

Hello everyone,

I have here an EQ.6 plus S300 from a friend.
According to her, the fuse (NOT the FI/RCD) of the kitchen falls as soon as she turns on the machine.

I have here opened the housing and measured the connection cable through.
Superficially looked at everything else and then times connected to the mains.
Lo and behold, the machine starts and runs probably the standard program of tests through.
Shortly thereafter it bangs briefly (has sounded like a short circuit) and the machine is off.
Fuse with me has not fallen. There is no smell and I do not see any burnt areas.

Does anyone have any idea what this could be?

PS: Please no explanations regarding electrical/electronic, I'm a professional Siemens EQ.6 plus s300

Hello, could these components cause the error. Flow heater, ceramic valve, brewing drive.

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All right, thanks for the tip.
Is there a list of set points somewhere when I measure through these components?

For the ceramic valve certainly not as far as I know, and for the other parts I measure against O.L.
Oh yes against green/yellow with the DLH

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The NTC sensors of the instantaneous water heater should have approximately the same resistance at room temperature and be between 50 and 60 kOhm.