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I was hoping one of our techs who is very experienced with these would pick this up, but he stays very busy and has a full time job as well. I am attaching a trouble shooting guide that may be of some help here. This can be caused by several things. Only some testing can really tell you what is wrong. Start by taking an AC voltage reading OUT of the genset while it is running. Turn off the breakers inside the RV first. This should allow you to take a "no load" reading. It is kind of odd that this was working fine just a short time ago and it has so few hours. The oil level or low level switch would be suspect and if the board is failing that would cause this as well, but I don't like just throwing parts at a problem. Get back to me with what you find on the readings and we can go from there. Print this guide out so you have it. https://www.flightsystems.com/pdf/onan-rv-troubleshooing-guide.pdf