Question about Kohler 17 kW Emergency Power System - 17RES-L

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KOHLER GENERTOR UU CODE 17RES - Kohler 17 kW Emergency Power System - 17RES-L

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Posted on Jan 02, 2017

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

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

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SOURCE: UU undervoltage kohler 20kva

call koler but ui think is meant high heat as in the thermal circut is shuting you down or low oil
could be a couple of things best bet call kohler

Posted on Aug 06, 2009

  • 5 Answers

SOURCE: My Kohler 17RES has stopped doing it's scheduled

On your Automatic Transfer Switch ( the little gray box you see on the right in the picture above) you have two blue buttons. One is a Manual test switch. The other has a clock on it and this is your exercise set button. Hold it down for a FULL 3 seconds if you want it to excercise without a load (not powering your home) Hold it down for a FULL 6 seconds if you want it to exercise with a load every week. Your generator will start and run for 20 minutes, and then shut down. Now every week your generator will exercise at the time and day that you pushed the set button.

Posted on Sep 04, 2009

SOURCE: my 3.5 kw kohler marine

Check that when you run it, it is not in fact making correct voltage (within about 10% is good), also make sure the engine is coming up to full speed, 3600 or 1800. You could check this with a multimeter that measure hertz. On the main output leads when the genset is running make sure it is getting close to 60 hz. or if you are in an area that uses 50 hz. check for that respectively. There are a couple things that would affect this, one would be your SCR module. There is a test procedure for this which you could find here. http://www.scribd.com/doc/50171916/tp6196-1 . I don't work on marine units, mostly standby so these manuals are for residential. Check your fuses, could even go as far as checking the wiring in the back and wiring and condition of the brushes and sliprings. These actually build field voltage to make 240 or 120 volts whatever your unit is configured to make. The brushes need to sit flat on the slip rings and on a unit with 10 hrs. the sliprings I can't imagine would be very dirty but check that as well. If you have an ADC2100 controller use this manual to go into the controller to verify that it is set for the correct voltage that the machine is built to make. The only other fairly simple thing to check that I've had issues with is if Kohler mounted a fuse block on the side of the cabinet mounted to the genset with no vibration isolation. Check these fuses while attempting to run the unit and make sure you getting steady voltage out of them as sometimes they will vibrate causing pulsed voltage to come out of them and can give you an intermittent UU, UF, or OC fault (undervoltage, underfrequency, overcrank).

Posted on Jul 16, 2011

SOURCE: My Kohler Model 17RES threw

The chattering sound is the stepper motor trying to cycle. Check to make sure there is no interference, move the throttle linkage by hand back and forth fully as sometimes the 17, 18, and 20 butterfly valve sticks on the carburetor gasket. If this happens, remove the gasket and use a file to put a good bevel (45 degree angle) in it to stop it from hitting. Thats all it takes.

Posted on Sep 06, 2011

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Check rotor slip rings,brushes then rotor and stator for shorts

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Aug 09, 2011 | Kohler 12 kW Emergency Power System -...

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My Kohler Model 17RES threw an Overspeed Shutdown code. I have been unable to reset the system. It makes a short "chattering" sound around the circuit board area when I try to manually switch the...


The chattering sound is the stepper motor trying to cycle. Check to make sure there is no interference, move the throttle linkage by hand back and forth fully as sometimes the 17, 18, and 20 butterfly valve sticks on the carburetor gasket. If this happens, remove the gasket and use a file to put a good bevel (45 degree angle) in it to stop it from hitting. Thats all it takes.

Jul 23, 2011 | Kohler 12 kW Emergency Power System -...

1 Answer

Code UU


Here is the code explained direct from Kohler's manual. I'd disconnect the generator load first.
UU Undervoltage Shutdown occurs if the voltage falls below 80% of the nominal system voltage for more than seconds. Check wiring and connections.
Reduce the load and restart the generator set. —
Check wiring and Check controller configuration, system voltage
and frequency (parameter UU).

Check AC voltage and adjust, if necessary. 5.7
Replace the SCR module and test voltage again. 4.9
Separately excite unit. 5.2
Check stator continuity

See web site for manual :http://www.kohlerpower.com/onlinecatalog/pdf/tp6196.pdf

Jul 11, 2010 | Kohler 12 kW Emergency Power System -...

2 Answers

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


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

Feb 04, 2010 | Kohler 12 kW Emergency Power System -...

1 Answer

UU undervoltage kohler 20kva


call koler but ui think is meant high heat as in the thermal circut is shuting you down or low oil
could be a couple of things best bet call kohler

Aug 06, 2009 | Kohler 12 kW Emergency Power System -...

1 Answer

Need to know


F refer to "field" of the motor. The stationary part of the motor. they are alternate positive and negative to generate the magnetic field for the rotation of the commutator, in turn generating the output.

Apr 07, 2009 | Kohler 17 kW Emergency Power System -...

1 Answer

UU lowvoltage error code residential generator


Could be the battery voltage. If your battery is not charging properly, the controller on the unit can do some funky things! Exactly how long does it run for? Is this in auto or manual mode?

Jan 17, 2009 | Kohler 12 kW Emergency Power System -...

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