Nemo Overvoltage Fault Codes

I had similar electrical issues with my Nemo. Check the battery itself. A bad battery can cause overvoltage errors and system failures. Worth checking before looking at the voltage regulator or alternator.

Did your fault codes also show overvoltage? Any other electrical symptoms besides the codes?

Yes, fault memory full of overvoltage errors. Symptoms were similar, random system issues. Sounds like a battery or charging problem. Get the battery and charging system tested professionally. Mine turned out to be a bad battery.

The workshop found the battery heavily discharged and defective, causing the overvoltage and system failures. Replaced the battery, and the charging system tested okay. Total cost 290€.