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Generac 20KW Generator Registering Underspeed Error Code

Posted on 8/30/21 at 8:16 pm
Posted by Catchfalaya
Member since Feb 2018
1921 posts
Posted on 8/30/21 at 8:16 pm
Any of you baws no what this means or how to fix it?
Posted by TigerTatorTots
The Safeshore
Member since Jul 2009
80773 posts
Posted on 8/30/21 at 8:18 pm to
Mine did the same today after ~16 hours of running. Turned it off for an hour, then pressed Auto and it fired up and haven’t had an issue since. Not sure what cause it since at the time we had very little load on it. Unit is basically brand new- installed last year and has 7 hours total on it heading into this outage.
Posted by NPComb
Member since Jan 2019
27348 posts
Posted on 8/30/21 at 8:19 pm to
PC loadletter issue
Posted by diat150
Louisiana
Member since Jun 2005
43535 posts
Posted on 8/30/21 at 8:20 pm to
It means that the safety system is not seeing the generator engine get up to speed. Could be that the sensor is bad or could be the engine is not getting up to speed.

Is it doing it when it first starts or after running for a while?
This post was edited on 8/30/21 at 8:21 pm
Posted by hollowpoint
Texas
Member since Sep 2019
1039 posts
Posted on 8/30/21 at 8:31 pm to
Engine not spinning fast enough… most likely starved for fuel or overloaded.
Posted by shoestring
Member since Nov 2012
257 posts
Posted on 8/30/21 at 8:39 pm to
Probably low gas pressure, sometimes you can pull the cap off the regulator and turn it up a bit and get it to 60hz
Posted by SG_Geaux
Beautiful St George
Member since Aug 2004
77964 posts
Posted on 8/30/21 at 8:47 pm to
quote:

Mine did the same today after ~16 hours of running. Turned it off for an hour, then pressed Auto and it fired up and haven’t had an issue since. Not sure what cause it since at the time we had very little load on it. Unit is basically brand new- installed last year and has 7 hours total on it heading into this outage.


You know you are supposed to change the oil and filter after the first 25 hrs of runtime?
This post was edited on 8/30/21 at 8:48 pm
Posted by TigerTatorTots
The Safeshore
Member since Jul 2009
80773 posts
Posted on 8/30/21 at 9:10 pm to
quote:

You know you are supposed to change the oil and filter after the first 25 hrs of runtime?
Yes, oil and filter were changed last month with its annual maintenance. So rather than at 25 hrs it was changed at 7 because it only ran for 7 hours in its first year
Posted by coondaddy21
Louisiana
Member since Oct 2012
3222 posts
Posted on 8/30/21 at 9:10 pm to
I can’t personally help but wanted to say that Generac is a garbage generator. Most people buy them because they are cheaper but you would be better off spending the extra 1k to get Kholer or Cummings than having to deal with these issues. I have a 30kw Cummings and that thing is a reliable beast.
Posted by lsu777
Lake Charles
Member since Jan 2004
31042 posts
Posted on 8/30/21 at 9:17 pm to
Happen to be a 20kw expert cause of Laura

Issue is the stepping motor part # 20190725

If you pull back the rubber gromet you should see a little circuit board under it, you can take your ohm meter and test it.

Here is how you test it LINK

What it looks like
[url=https://ibb.co/4RzP8zs] [/url]

Only other things it could be is low gas pressure or spark plugs.

So if it is the stepping motor, have to change it. It's easy but gonna be hard to find.

After you change it, if it's not raining

Keep top open with rag on control board to keep moisture off

Keep front panel off

Plug fan in and have it blowing on it

shite down every afternoon for 2 hours

Check oil daily, change every 72 hours.

Check air filter daily

Good luck. Air cooled engines don't work great in Louisiana heat.
Posted by Corn Dawg Nation
Member since Oct 2009
3530 posts
Posted on 8/30/21 at 9:18 pm to
possibly low pressure in the gas line?
Posted by Catchfalaya
Member since Feb 2018
1921 posts
Posted on 8/31/21 at 1:33 am to
After running for about thirty minutes. The neighborhood were in a few of there’s are going off n on as well from what I can hear. Could it be a gas pressure issue since everyone is using them?
Posted by DaphneTigah
Flying under the radar.
Member since Dec 2007
4980 posts
Posted on 8/31/21 at 4:46 am to
Almost 100% percent gas pressure.
Posted by LSUSaints
Gods Country
Member since Mar 2007
1144 posts
Posted on 11/30/21 at 1:15 am to
No doubt
Posted by DVinBR
Member since Jan 2013
12977 posts
Posted on 11/30/21 at 1:44 am to
nice
Posted by soccerfüt
Location: A Series of Tubes
Member since May 2013
65655 posts
Posted on 11/30/21 at 6:57 am to
quote:

Any of you baws no what this means or how to fix it?
Usually indicative of the low spark of the high-heeled boys.

The solution is (plainly) more traffic.
Posted by MikeBRLA
Baton Rouge
Member since Jun 2005
16457 posts
Posted on 11/30/21 at 7:11 am to
quote:

PC loadletter issue


WTF is PC Loadletter???
Posted by udtiger
Over your left shoulder
Member since Nov 2006
98730 posts
Posted on 11/30/21 at 7:42 am to
(no message)
This post was edited on 11/30/21 at 7:43 am
Posted by Harry Morgan
Member since Sep 2019
9193 posts
Posted on 11/30/21 at 8:15 am to
Posted by Richardlong10plus
Red Stick
Member since Feb 2018
161 posts
Posted on 11/30/21 at 8:16 am to
Possibly voltage regulator
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