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

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. —
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Replace the SCR module and test voltage again. 4.9
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See web site for manual :http://www.kohlerpower.com/onlinecatalog/pdf/tp6196.pdf

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