I agree with the above. You should be able to get some information from VRM about what was going on just before and possibly even during the alarm.
Just to add I’m guessing it’s not working at all now?
Perhaps also try following the shutdown procedure mentioned in another thread to make sure that it’s fully shut down and not getting any power from somewhere else which can be why it remains in an error state. I also saw another post on a Victron forum where someone mentioned leaving it off for ~12 hours can also help.