Yes, remove the fault and the washing machine will start. Elektrolux has no critical errors. You do not need the service mode here.
In theory, EH0 is a mains voltage or mains frequency error.
I understand that when you wrote that everything was fine with the current, the power was properly measured in terms of voltage and frequency and under load?
If so, you would have to look at the module, but it is rather a job for a good electronics engineer.
