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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14540
Experience:  Certified on Onan and Generac generators
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My onan generator is running but the light on the switch

Customer Question

My onan generator is running but the light on the switch Keeps flashing. What does that mean? It's an onan cmm 7000 efi
Submitted: 10 months ago.
Category: Small Engine
Expert:  Hank F. replied 10 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

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.

Customer: replied 10 months ago.
How do I reset it so it makes power?
Expert:  Hank F. replied 10 months ago.

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.