Question about Generac Guardian Electrical Supplies

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I have a generac guardian plus generator #43903, i haven't heard it self test for awhile, opened the lid and the redlight next toover crank is on, how do i reset this and is the circuit breaker bu

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 17.5KW Generator dies

If this is one of the big "taco cart" portables you need to check that the vent on the gas cap is open when you're running the engine. In the center of the gage on the gas cap is a little knurled knob, turn it counter clockwise (lefty loosey), about a half turn or so and run the generator.
If that doesn't solve your problem add to it here, otherwise please give me a rating I'm trying to build a little credibility here and could use the help.
Carl

Posted on Dec 02, 2008

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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

  • 384 Answers

SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss

Sounds like Generator mode switch should be "ON".

Posted on Sep 08, 2009

  • 14 Answers

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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I need a rectifier or avr for generac 3500 xl genarator


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  • Jun 28, 2016 | Generac Electrical Supplies

    1 Answer

    Why does it crank and almost start on 1st try?


    Generac Generator Troubleshooting - YouTube

    ? 1:39
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    Generac Power Systems - ConsumerAffairs.com

    www.consumeraffairs.com > Homeowners > Utilities

    Rating: 1.3 - ‎26 votes
    Hey, Generac, make a change and start making generators that work, don't cost .....Standby generators are not supposed to be used as a primary power source ... and three months ago, I spent $4,000 to have a Guardian generator installed at ...

    Generac standby generator - Propane - wont start?? - DoItYourself ...

    www.doityourself.com/.../487838-generac-standby-generator-propane-w...
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    How to change the fuel filter on guardian quietpact rv generator


    Dec 05, 2015 | Generac Electrical Supplies

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    My Generac HSB 17W AC Model 0055040 Generator will crank but won't catch and run. Propane tanks are full and have never been empty. What can I do?


    Check for igntition at the plugs, check power is going to fuel solenoid. If power is on solenoid check LP pressures and make sure it is opening. Be carefull LPV is dangerous any spark can cause a fire. Check to make sure the throttle is opening during cranking, if it isn't it's a control issue

    Oct 12, 2013 | Generac Guardian Electrical Supplies

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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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    My rpm sens light is flashing on my anunciator panel generator will not crank


    you may have to reset it, its probably shut its self down, on safeties. and wont restart till you clear it..

    Aug 13, 2011 | Generac Guardian RTSE200A3 200 Amp...

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    I hava a 20kw NG guardian gen. When it does its weekly 12 min. test run it most always runs rough and seems to be choaking itself to death.


    I have a 400kw unit that does the same thing, I found the regulator needed to be execersized. when the unit starts I shut the isolation valve ahead of the regulator and then when it almost shuts of the gen. i open the valve back up and then everything is ok, hopefully after awhile it will work right.

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