Question about Generac GUARDIAN Liquid-Cooled Standby Generator -25 kW - QT02516ANSN

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I have a generac 25kw generator, the other night the power went out and unit didn,t start. I went out to check it and the fault light was on. I turned the toggle switch to off then to auto and the unit started and the lights came on for a short period then shut off , the motor was still running but the starter kept trying to engage. then the unit shut off. retried this again with the same results. the unit will do the same thing when trying to run in manual with power breaker in the off position, any answers for this issue?

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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CarlGehrke
  • 169 Answers

SOURCE: Generac Guardian 15kW Generator

That sounds just about right, if the relay contacts get welded together it sometimes takes out the driver on the printed circuit board. As you found out, 12vdc from 23 to 194 makes the transfer switch move to the Generator position, relay not energized makes the ATS move to the Normal position.

You can make a nice test function by installing a 10 amp contact switch in series with either the N1 or N2 terminals. When the switch is open the generator thinks the Normal power has failed.

Regards,
Carl

Posted on Jan 26, 2009

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  • 26 Answers

SOURCE: Generac 4456 does not start on power loss

I install and work on these everyday. If you hooked up the transfer switch you probable have a control wire wrong. check the utility power sense wire. That lets it no when to start in auto. it could be a relay or fuses. or a control board.

Posted on Jul 09, 2009

protek480
  • 1714 Answers

SOURCE: The generator starts up runs for about 15 seconds and shuts down.

Check the oil pressure switch

Posted on Aug 21, 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

  • 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 have a 16kW Generac Guardian Generator with a 200 amp house service RTS panel (installed 2007). Last night the power went out and the generator started but the unit did not switch to use generator


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

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Hi,
Sounds like the you have no spark since when you force the engine to crank it never fires. The low battery light come on because the 2 sec of cranking lets the voltage get lower than the alarm threshold.
I'd connect a spark tester to either of the plugs and try a manual start, if you see sparks replace the plugs, if you get no sparks then you've got to troubleshoot the ignition modules and the kill wire that comes from them.

Regards,
Carl

Feb 23, 2009 | Generac Electrical Supplies

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