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

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Generac Guardian 12 KW Model 04456-2 shuts down on overspeed in cold weather

Need correction info

Posted by H. Leigh Peterson on

  • H. Leigh Peterson Jan 20, 2012

    Need assistance

  • H. Leigh Peterson Feb 15, 2012

    Runs ok on manual but trips out in three to four minutes on auto start.



1 Answer

J E White

  • Level 1:

    An expert who has achieved level 1.

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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.

Posted on May 23, 2012


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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



  • 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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