Here is an article about overspeed of diesel generator, hope it can help you:
https://www.dieselgeneratortech.com/diesel-generators/The-cause-of-overspeed-in-a-diesel-generator.html
SOURCE: Generac Guardian 17.5KW Generator dies
If this is one of the big "taco cart" portables you need to check that the vent on the gas cap is open when you're running the engine. In the center of the gage on the gas cap is a little knurled knob, turn it counter clockwise (lefty loosey), about a half turn or so and run the generator.
If that doesn't solve your problem add to it here, otherwise please give me a rating I'm trying to build a little credibility here and could use the help.
Carl
SOURCE: Attempted to start Generac Guardian 15 kw air
I work on these every day. Its either gonna be the rotor or stater, the voltage regulator, but most likely its a bad stepper motor which is the throttle motor, or control board. Thats all that could be causing that so its one of those. If its the rotor or stater thats bad it causes the generator to RPM up because it thinks its not producing enough power due to that. I had the same problem with the same one we just fixed and it was the slip rings on the end of the rotor so bad rotor.
SOURCE: Generac Guardian 15 kw overspeed fault
Did you remember to set the overspeed shutdown threshold on the control board?
SOURCE: Generac Guardian 12 KW Model 04456-2 shuts down on overspeed in cold weather
Leigh,
See my 5/22/12 comments on my "overspeed fault" problem resolution [Generac 43903 standby Generator overspeed indicator on starting] . If it only runs for a few seconds and then quits, you may have a similar condition to the one my unit had. A good technician should be able to diagnose the problem and determine if you have a similar failure to the one I had, or one of the other causes suggested by RSG000.
SOURCE: why want a 20kw generac guardian home generator not switch back to utlity power ?
Contacts are burnt
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