Jfyi,to correct some misconceptions in this thread on Onan 5500.
1)Onan 5500 is Not a inverter, its a generator only
2)Onan 5500 is an air cooled engine,
absolutely no over heat protection or no overheat safety shut down at all
First place to start troubleshooting your 5500 is to get the trouble code from the controller.
Use the manual to find out how, its easy and well explained in owners manual.
Once you get the code # come back and tell us so we can help.
Everything else is a guess at best. If you don't want to chase your tail around, trouble code is the best way to start troubleshooting the 5500.
jmo
