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

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UU lowvoltage error code residential generator

Engine cranks, turns over briefly then shuts off and UU code appears.

Checked oil: OK

Suggestions?

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  • t_jeepster May 03, 2009

    The red light on my fuse box started to blink constantly. So when I went to check the generator box, UU appears on the display. What does this mean and how can I fix it?

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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?

Posted on Sep 04, 2009

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1 Answer

Gas in crankcase


Fuel from the fuel tank flows to the carburetor and then on into the engine cylinders. From there it seeps into the crank case.
It's a matter of gravity. The gas will seep until it reaches the lowest point in the engine.
There are two methods of correcting this dangerous problem.
1) When you are done using the engine you can turn it upside down, over a large container that is of sufficient size to contain all the gas and oil that will run out of the engine.
or
2) Turn the fuel valve to it's OFF position when you are done running the engine. This stops the fuel from seeping into the crank case from the carburetor.
(And a heads up from one who has personal, first hand experience. Be sure to OPEN the fuel shut off valve when you think you would like to start the engine.)
If you should have this happen again DO NOT try to start the engine!
(That's one of the reasons The Da always said, "Did you check the oil before you started that engine?")
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1 Answer

To much oil everytime oil is checked


Hi and welcome to FixYa, I am Kelly.

This is usually caused by the carb overflowing when the generator is OFF and filling the crank case with gas. I.e there is debris in the loat needle seat and the fuel is not shutting off when the float is level so it leaks by.. into the engine and eventually makes it's way into the crank case. via the piston rings.

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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 -...

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Means that the engine has turned over for too long without starting. It times out to protect the starter and battery wiring.

May 22, 2010 | Kohler 12 kW Emergency Power System -...

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

1 Answer

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Check battery volatge while you are cranking engine if voltage drops below 9 vdc you have a bad battery. If it doesn't you probable have a bad starting solenoid or a bad ground at the starting solenoid.

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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

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