If it is an Onan, it is probably a fault code or alert of fault. We need more info on the generator and if you have an auto gent start system on your coach. What years is your coach by the way? If it is an alert; three flashes and pause, push the stop side of the switch once to get a two digit code by number of flashes. Look up code in owners manual.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7