Look in your Onan owners manual. It is clarified there. In our 11 year old Onan, the reset button is right there, very easy to reset......after you remove the Onan cover.
One word of advise to anyone removing the Onan cover. Because the generator is behind a PC access door, it is easy to misalign the Onan cover when putting it back on. Make certain the bottom of the cover rests in the Onan grove, not the PC framing, before latching the cover. You don't want to loose your Onan cover. It is important it be there for proper cooling air flow through the generator.