Question about Generac 13,000 Watt / 13,000 Watt Home Standby Generator

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I have a 4456-2 12kw generac generator that shuts down after a few seconds. it appears to be an overspeed condition and adjusting the governor doesn't seem to change anything. Do you have any helpful advice that i may try?

Posted by Anonymous on

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Posted on Jan 02, 2017

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  • 26 Answers

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.

Posted on Jul 09, 2009

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SOURCE: Generac 43903 standby Generator overspeed indicator on starting

I have a generator that did the same thing. It would start and then stop within a few seconds. The more expensive generators have an oil level safety switch to prevent the engine from burning up. There is usually a wire connecting to the switch on the outside of the engine near the oil fill hole. Remove this wire and try to start the generator. If it runs without a problem then it is the switch. You need to remove the switch and take it apart carefully and clean it. There is a small float inside the assembly. When the oil runs low the float allows the switch to short to ground which kills the spark to the spark plug. Hope that helps.

Bob Janelli

Posted on Oct 01, 2009

Testimonial: "This is good information in the event that the low oil switch is part of the problem."

  • 1 Answer

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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