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

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I have a 7kw Generac generater and it has an over speed error or fault.

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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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Keep getting under voltage fault. I have cleared fault several time. generator will run for short period then fail.sometimes the fault is underspeed.


See if reducing the number of things connected to the generator will stop your problem. Disconnect or turn off some things that are not totally necessary.
To properly generate electricity, the engine is required to maintain an rpm within a specific range. If you load down the generator with too many things pulling power, the engine will not have enough HP to turn the generator within the set rpm range. It goes under-speed or under-voltage and you get a fault.
Going to the extreme, if you disconnect everything from the generator and it still fails, you have a generator problem

Sep 19, 2017 | Electrical Supplies

2 Answers

I need a rectifier or avr for generac 3500 xl genarator


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    is engine running at 3600 to 3700 rpm at full load. most small engines run at this speed.you can buy a small tach on ebay TINY TACH.. you have to know what the engine speed is

    Mar 04, 2013 | Electrical Supplies

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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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    Generac 7KW, Model 005251, 3 yrs old. Natural gas pressure measured 6" WC at generator when installed. When installed, dealer had to turn fuel regulator screw all the way left to get engine to start. Has...


    check pressure of the fuel line running in to the regulator it sounds like you have not enough gas coming in and the if it is good was the screw reset after the bellows was replaced?.
    ether way it sounds like it is starving for fuel. hope this helps

    Aug 31, 2010 | Electrical Supplies

    1 Answer

    Small 7kw Generac has always sounded rough over the three years we've had it. Oil and plug are fine but lately, after warmup, engine seems to misfire and eventually shuts off during the normal weekly test...


    If the generator is out of warranty, you can try spraying a short shot of ether into the intake of the generator as it is running rough. If the engine smoothes out for a few seconds, and returns back to original state, then it is likely running lean. Check the gas regulator (this is LP or natural gas I am assuming since it is standby), the vent may be clogged on the bottom of it.

    Feb 11, 2010 | Generac Guardian 100 Amp Transfer Switch...

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    Generac Guardian 15 kw overspeed fault


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

    Apr 03, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

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