Kohler 12 kW Emergency Power System - 12RES-L Logo
Posted on Mar 31, 2009
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Overcrank error message - Kohler 12 kW Emergency Power System - 12RES-L

  • Anonymous May 02, 2009

    genset won't start, select on goes to cc1 then straight to oc. The digital reading is 0.8. The power to the out side of the genset is 13.16.

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Craig Butler

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  • Posted on Jul 02, 2009
Craig Butler
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The 'overcrank' error simply means it tried to start but never actually started. It cranked for an extended period. Check the fuel and starting issues you would normally check to start the engine.

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Julie Kaufman

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  • Posted on Mar 13, 2014
Julie Kaufman
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03-13-2014 Natural Gas Generac Generator with an Overcrank Alarm on the inside and a Red Light showing on the outside. My problem: The natural gas supply was temporarily turned off during a time period when the generator was scheduled to run. (It is scheduled to run once a week.) There was not anything mechanically wrong with the generator. I turned the inside switch off and cycled through the menu, (similar to a laser printer.) At this point, I turned the inside switch back to auto, my error message was gone, and the light on the outside turned green.

  • Anonymous Jun 11, 2020

    This TOTALLY fixed my issue!! We had a tankless h20 heater installed on the day the weekly run was scheduled, and voila! 1100 code / overcrank. Did exactly what Julie suggested, 10/10!!

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I have an 8KW Generac gas generator. We had a power outage and it didn't auto-start. ALARM - Overcrank msg. Started it manually. Weekly exercises are fine (It's cold and snowy here .. relevant?)

By "gas" I assume you mean gasoline? Overcrank means too many starter revolutions without engine run which agrees with no auto-start.


If gasoline, suggest you drain the fuel bowl and some of the tank(pint or so). Capture fuel into container. Then transfer to a transparent/glass container and let set a few minutes. Then look for a water line(fuel is lighter than water and will separate). Line high in jar means lots of water. If any sign of water and you need to clear the fuel system and tank. Then completely fill with FRESH fuel from a trusted source. Or if refueling too far, if you only use fuel from top of container that has sat for a few minutes, the water is on bottom and fuel on top.
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I have a 20kw es onan generator that had a bad alternator. i replaced it and now the engine shuts down after a couple of minutes with an overcrank error.

Overcank failure means the engine failed to start.

IOWs, the control module commanded a crank engine but received no indication that engine ran.

Now your engine obviously runs, so the fault is likely rpm sense into or by lectronic control module.
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You most likely have a fuel problem. Either not enough or too much pressure. What fuel are you using, propane or natural gas?
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How to diagnos Overcrank light

I don't think the over crank is a problem.
Why is it shutting off?
Find the owners manual to find out if there is some fault that will shut it down or it may be an engine problem like the choke not releasing after starting.
To find a manual online you will need the make and model number of your generator.
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Maybe the start motor is damaged. You can check it first.

Power generation: www.dieselgeneratortech.com
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Overcrank alarm is coming because the unit failed to start
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Overcrank means that it tried to start and couldn't. It will go through 5 crank cycles and then stop with this alarm. Switch to off, hit enter to clear fault and then try to start in manual. Check to make sure you have fuel and pressure is 11 to 14 in WC.
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You turn the unit to the off position, hit enter twice on control board, and put back in manual, this should reset this fault
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if it a standard check the cluch safety switch, i had a switch come apart on a f250 before and caused this
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