Kohler 14 RES Generator Kohler ATS: RDT-CFNC-0100A We did the installation and we simulated power loss. Everything worked ok 3 times but now it doesn't. The generator's display show ATS as error code. The Generator works ok, we can get it to run manually. We checked all the wires and connection and everything looks ok. Thanks

Hi,

if possible please check your speed sensors within your generator to make sure each is still functioning properly. Otherwise, you might have to replace the sensors before the code goes away.

Thank you.

have an electrician check the relay that is activated when the utility power fails
that is what starts the genset when it is in auto
it should also stop the get set when utility power comes back on

I answered this twice already?

Check the inlet fuel pressure, on exervise there is no load, when power is out it is loaded and demands more fuel. Also check for bugs blocking gas regulators vents etc

I finally solved the intermittant starting problem on my Kohler 12 RES by replacing the strater and the starter relay. I was also experiencing the occassional OC indication, red blinking LEDs on the ATS, and intermittent non-starts during the weekly exercises. The problem happened during power outages a couple times also. If I flipped the start switch between auto and run quickly the generator would occasionally start. Once started, the generator runs fine. I ordered a new starter, which included the starter solenoid. By the way, don't worry about the genuine part thing..the old starter was a Delco made overseas. I ordered a new starter online for $85 (6744N) and it was indentical to the genuine Kohler starter. Replaced the starter and it improved the problem but did not totally solve the intermittent starting. Ordered the starter relay (GM49746) replaced it and the problem is solved.

Disconnect the control wires and see if it still does it

I have a Kohler 12RESM1 whole-house generator with a 200AMP RDT, MPAC 500 Automatic transfer switch (ATS) in my home. The system was installed in 2006 and has been working great since. Several weeks ago I began noticing that the weekly tests weren't occurring on schedule and that the generator would initiate a starting crank for a couple seconds several time a day. The false starts began occurring more frequently as time progressed. (BE very careful!! You will be killed if you are not careful!! ) In order to isolate the trouble between the ATS and the generator, I disconnected the 2 start circuit wires from the ATS controller (2 wires on green connector). The problem stopped, which led me to believe the problem was the ATS controller board. The controller board in my ATS is a GM35950. After removing the board (BE very careful!! You will be killed if you are not careful!! ) and doing a little troubleshooting, I determined the trouble was the set of .47F 5V super-capacitors. These are the 2 black oval-shaped cans behind the relays that appear hot-glued together. I ordered 2 new caps from Digi-key (approx. $4.00 ea). The P/N is PB-5R0V474-R. Replacing the supercaps cured the problem. Don't be fooled, these capacitors are .47 farads, not .47 microfarads, thus the reason they're called Supercaps. They function similar to a battery in this application. Oh by the way, I ordered a couple extra Caps. They have a 1000 hour life expectancy, so I suspect I'll need to replace them again in 6-7 years. Good Luck, I wouldn't advise attempting this job unless you have the proper soldering equipment and are experienced with electronic repair. There's a company that will repair the board for $170. Try googling "Kohler GM35950 repair".

http://www.kohlerpower.com/onlinecatalog/salesservicelocator.htm

sounds like the voltage sensor is either mis adjusted or burnt up. Also could be a wire disconnected on the voltage sensor board.

The e-prom controls how the ATS behaves. It is very important to install the e-prom, so that the ATS works when power fails.