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

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Guardian 8k overspeed issue

Installed unit in Aug 2013 and it excercised fine the 1st month. As of Sept. started with "error 1200 overspeed" problem. Had tech check it out and he stated that it could be a pipping issue with N/G short run (4')3/4" to 1/2". My plumber redid the pipping to all 3/4" as suggested by "generac" problem not solved. Also why is the included flex pipe 1/2"?? My plumber believes its either the control board/gas regulator. Has anyone had the same problem and how was it "fixed"!!

Posted by Anonymous on


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Posted on Jan 02, 2017

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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

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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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