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It turned out to be a control unit issue. A new Voltage Regulator was wired in, (Datakom AVR-12) and all fine.

Have the same problem on the Kohler 9EFOZD. Does not start on the remote electric panel with the AUTO mode, but starts fine on the generator itself. In addition, it now comes up with UU fault code after starting normal and running for 10 seconds.. (Means UNDER VOLTAGE) New board looks like a...