Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The flashing light while the engine is running means that the unit is in ERO (engine run only) mode.
This happens when a bypassable fault occurs, and you restart the genset within 1 minute. The engine will run, but no power will be produced.
There is no simple reset. The unit must be completely diagnosed, the problem found and fixed, then it will run again.
Sometimes it can be a pretty simple fix, and other times it will be required to take to a dealer for repairs.
The computers on these HGJ units can be extremely difficult to work with if you don't have a special scan tool from Onan.