What can i do to reset generac 0058750 genset under voltage alarm?

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Embedded processor memory error. The genset processor runs a periodic sum of all instruction memory space and compares it to a known value "check sum". Your unit has failed this test which means processor instruction space is potentially corrupted. This is a fatal error and it will not allow the genset to run until it is corrected. Likely this will require replacing the control board.

The overload fault is indicating that your connected load is overloading the generator capacity and it's tripping off. Check your connected load (what ever is hooked up that you're trying to power). You need to use an amp meter to verify the amp draw, and also the rated voltage output. If it's low voltage, could be low engine RPM or voltage regulator. high current indicates a problem with load your trying to power, ie-- Motor or other load.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

it has to be hooked to a battery

When you get the under speed alarm is the generator under load? Try manually starting the generator with no load and let it run for a while, if no alarm, then put it under your home load and measure current draw (maybe have an electrician check it) if the amp draw and in rush caused by compressors, pumps motors etc are within the generator rating, check your fuel pressure, on average 8-11 WC Nat gas. Pressure may test well under no load but drop starving the engine of fuel unde rload. Underspeed is just that engine cannot make RPM/Frequency

You turn the unit to the off position, hit enter twice on control board, and put back in manual, this should reset this fault

Remove front cover on the genset and you will see the brushes and rings. Clean the rings if black with emory cloth and inspect brushes. Flash the fields by apply a 12V battery to the brushes. the brush closest to you or the bearing is connected to the positive side of battery and the back brush is negative. You have to do this with genset running. You should notice your voltage climb up to over 50Vac maybe even over 100Vac. Make sure to use rubber gloves when flashing fields and keep hands away from rotating parts. if voltage does increase when flashing the the voltage regulator is shot. If voltage does not climb then you will need a new genset or generator end.

My answer:

Your Genset is made by GENERAC same as my personal 5500W home unit is. Great service and great Genset!!

I never had any problems with mine other then the Poly gas tank valve stem gasket leaked from day 1, and they replaced it no bones 100% FREE upon request. I also requested both a Service manual and an Operators Manual and they sent me both FREE of charge as well. (I had no manuals with mine either, as I bought my Genset brand new at a garage sale for $300 - great deal)

Just make sure when you call them (as with anyone seeking operator/setup manuals - that you tell them they got LOST in a recent move!) It helps - otherwise they (any company) might ask for a charge for them. Getting pretty bad out there everywhere thanks to you know who!

Call the GENERAC toll free # below anyway - regardless what it says below about the GUARDIAN brand and where to get service. You want the Install / Service manuals only.


Corporate Mailing Address
Generac Power Systems
Hwy. 59 & Hillside Road
P.O. Box 8
Waukesha, WI 53187

GUARDIAN® Inquiries
All GUARDIAN products are sold through and represented by our Independent Dealers, The Home Depot® stores, and GUARDIAN Authorized Service Centers nationwide. For information or questions about GUARDIAN products, please contact one of these representatives. To locate a dealer nearest you, please visit the Dealer Locator page on the GUARDIAN Web site.

Generac® Inquiries / Customer Support
For Information or questions about Generac generators, switchgear products or Generac OHVI® engines, please call the phone # below. If you need immediate assistance, our Customer Support Department is available Monday-Friday, 8:00 a.m. to 5:00 p.m. Central Standard Time.

Phone: 1-888-GENERAC > 888-436-3722
Fax: 1-262-968-3791

Please post me a reply as to finding this solution being the best resolve to your GENERAC / GUARDIAN service manuals problem by following my recommendations above. Also please rate my troubleshooting fix as well.

Keep me posted and I'll follow up as well.

Best regards,

Frank