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Generac 14kw, overspeed fault - Generac Electrical Supplies

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  • Generac Master
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Thers a problem with the stepper motor that controls engine speed according to generacs manuals. if you dont have one i suggest if you plan to repair it yourself get one . also join ziller electrics online forum for help

Posted on Nov 18, 2017

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5 Related Answers

CarlGehrke

Carl Gehrke

  • 169 Answers

SOURCE: 10kw Generac shut down overspeed

Make sure that the throttle linkage is all there and not damaged/misadjusted, then get a manometer and check your inlet gas pressure. Gas pressure should be 8 inches of water column and stay there running or not.

Carl

Posted on Apr 06, 2009

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RSG000

  • 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

Anonymous

  • 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

J E White

  • 1 Answer

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.

Posted on May 23, 2012

emissionwiz

Marvin

  • 85239 Answers

SOURCE: GENERAC 14kw natural gas generator. Low RPM

I am sorry but you have selected the wrong product category. Please re-post in correct category. Thanks

Posted on Aug 29, 2012

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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.

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I have a generac 22kw model QT02224anan that will run for a few minutes then shut down , then the over speed led is lit. It only happens when it is under load or during a power outage. it goes through...


its possible the overspeed is set to sensitive. or your rpm are to high. these are preset in the factory as a safety, check your manual to ensure your rpm speed is in the pre set area. generators will do this under load when you have a big load on them or take a load off. the governor will some times over compensate causing it to trip on overspeed.

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2 Answers

10kw Generac shut down overspeed


Make sure that the throttle linkage is all there and not damaged/misadjusted, then get a manometer and check your inlet gas pressure. Gas pressure should be 8 inches of water column and stay there running or not.

Carl

Apr 06, 2009 | Guardian Electrical Supplies

2 Answers

Generac Guardian 15 kw overspeed fault


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

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