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What could be the cause of overspeed error on a 15-year-old 15 kw stand-by Generac Guardian?

We have a 15-year-old Generac Guardian 15 kw stand-by generator. It has about 108 hours of run time on it. Battery was just replaced, and oil and filter were recently changed. Today during its scheduled run cycle it struggled to start-up then stopped running after about 5 seconds. It has an overspeed error and a popped spark plug won't go back in. It will run, but for no more than 60 seconds. Any idea what could be causing this? Is it something that we could potentially repair? Or, is this a job for an expert?

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Posted on May 17, 2019

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SOURCE: Generac Guardian 15 kw overspeed fault

Did you remember to set the overspeed shutdown threshold on the control board?

Posted on Jun 07, 2010

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