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Most of these fault codes relate to batteries that are too discharged to function properly or are failing. Start by having them load tested and checked for internal shorts and clean the cables including the ground lead to the chassis. Then reset the inverter and hopefully this will resolve this. IF NOT, get back to me and we can do some testing. All follow ups are included in our fee.
Even brand new ones fail and so that is always the first thing we check. It may be an automatic transfer switch failure due to a short. That should be checked with a meter. It will be at the terminus of the shore cord. Lid comes off for testing.
Did you check the automatic transfer switch to see if that was damaged? That takes a small digital multimeter. The cover comes off and I can direct you in that.
Just checking back in to see if perhaps you needed help in testing the transfer switch? Please get back to me if you need more input from me in order to resolve this issue. All of the follow ups and exchanges are included in our fee and a phone option is available if you think that would be more helpful here.