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I used to get that error only when the printer tried to move something, or when I selected "home printer head" from the maintainace menu. Ultimaker suggested I tried resetting to factory default. So now I can't get past the welcome menu.
The problem is actually on all axis ER32 + ER33, while all switches tested fine.
I think you're right about it being a chip problem.
If you look @KUBAKHAN 's next post it is about swapping the main board 😬