Check the circuit breakers and replace the broken ones if the the generator is running and there isn't any AC power.
Change the fuel filter, as well as the genset. A black/brown substance around the exhaust shows that the fuel filter should be changed.
Inspect the DC cables behind the genset to make sure they are clean and tight. If they are dirty, clean them with a mild cleanser and tighten them with a screwdriver.
Remove the screws from the cover and check all wires for loose connections.
Check the oil to see if it is low when the start/stop switch flashes. If it is low, add as much oil as suggested by the owner's manual.
