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Hello, my name is ***** ***** I am going to assist you with this.
What is the serial number of the genset?
I have checked Generac's database, and this unit is not registered.
You must register the unit before setting it up.
I thought it was weird that it would run, but their database is not showing it as registered yet.
I've never actually seen a code 1800 on a Nexus controller yet, and find it odd that the manual doesn't list a single troubleshooting step.
The first thing you need to do here is to connect a voltmeter and a frequency meter, and run the unit through a couple of test cycles. What direction to go hinges on whether the unit is actually going over voltage or not, and if it is, whether it is just voltage, or if it is voltage and frequency.
That was my mistake - I meant to say Evolution, as the Nexus controller does not give those codes.
Your source voltage had nothing to do with the Over Voltage code on the genset. The Over Voltage means the genset is putting out too much voltage.
If your genset is actually putting out 240V like it should, but you are getting an Over Voltage code, then the controller is having an issue.
The best thing to do here would be to get an authorized Generac technician out there to fix this under warranty.
The controller is not an inexpensive item.
Was this what you wanted to know?