Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This fault means that either the generator is not producing enough voltage, or the controller can not sense the voltage.
There are many causes for this - almost every part in the genset is suspect.
Troubleshooting this will require a good digital voltmeter.
But I would encourage you to contact an authorized Generac facility for repair under warranty.
If you try to work on it yourself, you could easily void the warranty.