Yes, all the receptacles including the fridge are on the one circuit. I don't know which of my actions working on the receptacle fixed it (I didn't have it right apart, just bent the wires back and forth by where they go in/out, so it could come back again suppose.)
The receptacle is duplex and the three-light in the top showed Open Neutral while the extension cord plugged into the bottom was running the charger, so I suppose the open was in the top part and not the bottom part if you need the neutral.
Can't you still run things from the 120 across hot and ground? If you need the neutral, how can things run off the floating neutral Honda? (but that is not the same light as the Open Neutral on the tester)
When that receptacle showed Open Neutral so did others I checked which goes with the Google article I read that said finding the open can be difficult as it could be anywhere. It did say something about damage so that made me remember the slide-out incident several weeks ago. (all receptacles etc worked ok off the inverter as whole house, but the inverter is floating neutral anyway I believe.)