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I have a Kohler 25KW industrial generator showing 'auxillary fault' that will not run.

Spec code GM19369-GA3. Model #20REOZJB. It's showing a code 'auxillary fault', and will not stay running more than a few seconds each time I try to start it.There is a triple-gang circuit breaker mounted on the side of the INNER generator housing - each breaker is rated 3.5 - I'm guessing these are for the exciter. Anyway, I found that if I shut this 3 gang-breaker OFF, the engine starts and runs normally, but as soon as I flip this triple gang-breaker ON, the engine shuts down in 2 - 4 seconds, and the Auxillary Fault light comes on. [My controller has 16 lights] What to check?

Posted by David Leland on


5 Related Answers


Carl Gehrke

  • 169 Answers

SOURCE: kohler 12kw generator starts but shuts down after 3sec

Your gas pressure is too low and you may not have a large enough supply pipe. You need at least 10 inches of water column with the engine running to operate an LP vapor fueled engine. Because the engine is starving for fuel, its governor opens the throttle to WOT (so it goes to high revs) but there isn't any fuel to make horsepower with so the output voltage falls and the undervoltage alarm trips.


Posted on Dec 03, 2008



  • 1 Answer

SOURCE: Kohler confidant 4 generator will not run.

i got the same gen and with the same problem

Posted on May 06, 2010


Bryan Fullerton

  • 661 Answers

SOURCE: Kohler Model 12RES LP gas generator starts

Sounds like a short in one of the windings to me. Can you verify that the engine rpm is not exceeding specs? If you can modify the engine speed Id say slow it down and see what the voltage read is.

Posted on Jul 22, 2010



  • 97 Answers

SOURCE: I have an 18kw kohler

change the temp sensor and re test the gen set these have a bord that senses if theirs a issue with the engine and will cut the bower to the get head so theirs no load on some mod's then when the temp reaches a higher point they shut down. re-post is this does not fix the issue i will review the books on the unit.
hope this helps

Posted on Sep 01, 2010

Tim Venetis

  • 260 Answers

SOURCE: I have a model #

Make sure oil level is up to par. When it shuts down take the wire off the low oil switch and see if it runs.

Posted on Mar 22, 2011

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