Question about Kohler 12 kW Emergency Power System - 12RES-L

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I have a Kohler 12RESM1 propane generator with oc/uu code

I have a Kohler 12RESM1 propane generator for my off grid system. In the auto mode it cranks for a few seconds and does not usually start. I get the oc code, today also got the uu signal. any ideas to make this auto start work. 100% start on manual mode. thanks

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  • Randy Flamm Jun 24, 2012

    I have a Kohler 12RESM1 propane generator I use for grid stand-by. In the auto mode with an RDT0100B it cranks for a few seconds and does not usually start. I get the oc code. It always starts fine in manual mode. If I don't reset the oc code it will not start when there is a power failure. Any ideas to make the auto start work?

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U need to make sure that the relay driving ur auto start stay closed all thru the crank cycle.

Posted on Nov 30, 2012

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I am getting the same exact problem and errors with my 12RES Kohler generator. It will try to start using a remote switch but fails. Then it will start using the switch at the generator. The error code it comes up with using the remote start switch is usually OF or UU. It is less than a year old. Can Kohler Help??? Dave R.

Posted on Feb 20, 2010

  • Steve Oct 23, 2013

    Make sure you have good gas pressure.

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Here is the code explained direct from Kohler's manual. I'd disconnect the generator load first.
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