Question about Generac 13,000 Watt / 13,000 Watt Home Standby Generator
After 1.5 years my Generac 43903 standby Generator now refuses to run more than 3-4 seconds and stops with an overspeed led light lit. Will start on manual setting, but still stops as described above.
I once got it to run normally on manual, and set it back on automatic, but the next time it tried to do it's weekly test run, the same problem came back. I have tried removing the 15a and 7.5a fuses to reset the control board, but that did not work, now it wants the exercise cycle reset and the unit won't reset.
How can I determine if there is a sticking governor, or other problem?
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.
I’m happy to help further over the phone at https://www.6ya.com/expert/bob_62dfa2f81bb55288
Posted on Oct 01, 2009
Testimonial: "This is good information in the event that the low oil switch is part of the problem."
Check the starting battery. If it is low, the n cank LED will light, and the unit will just click. remove the battery, charge it, fill the cells with distilled water, and put it back in the generator. Carefull to not short the battery leads when you remove the battery. Just went trhu this with mine and all better now. Battery leads were either loose or the cells had lost so much water in teh heat we're having this year, the battery couldn;t start the generator, thus 'overcrank' - actually , it just didn;t run, but thought it did!<!-- from fixya rte -->
Posted on Aug 11, 2010
I'm having the same problem with generac unit. It's got the 6- cylinder motor and runs on a natural gas line. It will test run fine on test run sometimes. Other times it revs too high and the over run light comes on. Shutting the system down. Need to figure out how the run speed is set and why it is not staying at the preset level.
Posted on May 20, 2012
I HAVE 15KW GENARAC AND WILL ONLY RUN FOR 10 SECOUND I CHANG OIL UNIT TEMP UNIT THROTTLE WELL FREE AND LUBED AND STILL THE SAME THANKS JOE
Posted on Aug 03, 2011
My Generac 35K Propane gas unit was experiencing overspeed. It would briefly turn on, ramp up to high speed, and after a few seconds shut off completely. The issue was the Solenoid Regulator was stuck.
The service guys came in and tapped at it and then it freed momentarily and then it stuck again in the opposite direction. When that happened, it no longer got fuel. They replaced the Solenoid Regulator and it started up just fine and is operating well.
The solenoid is a small device with a magnetic coil that moves a plunger to allow fuel through. When it was stuck in one way, it was running rich. When it got stuck in the other side it didn't get fuel and wouldn't start up.
It looked like this model
Generac 0F5022 Solenoid Coil Regulator
Posted on Sep 01, 2019
Have the same new issue with my 17kw.
The tech came out for a couple of hours and determined that one cylinder had low compression which gave the overspeed messages. It does the same think , starts and runs for about 10 seconds. He suggested replacing the engine. I have a hard time believing that.
Posted on May 19, 2018
Over speed ingeing alaram. them strekap the ingeing.prai wehil said runing weth dainamo avr or gavenar problam
Posted on Jan 20, 2013
I just installed two 8k units with the same problem, the arm on the stepper motor fell off and one of them I couldn't get to stay on so I put a screw through it, it is a crappy setup.
Posted on Oct 31, 2012
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