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Selftest Error MK2s MMU

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i get a selftest error on the hotend Fan.

When printing the fan works fine, but i cant get pass this first test.

Checked all plugs and connected even a new fan - no change...:(((

I ran into the same thing. Try giving the fan a spin by hand, or with air pressure, as the test starts and see if it completes the test. Mine did. I figured it was a bad/poor fan that was having issues starting up. Not sure what the initial speed of the test is. Mine prints fine and the fan works while printing so I never changed it, just needed to get past that test.
Hope that helps.

Thanks, i found the Problem - it was me F**!!!!''####
When the test says start i pressed the Knob to Start !
Just like when u load the Filament and u press the Knob to Start!
Damm, i wanted to sell the Printer and show the Buyer that it was A-OK and failed...
Ofcourse he didnt buy it :((
Stupid me...
Thank you