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I have Kohler marine Genset It run in manual mode but when I start it in auto it do not start due to indication of LCL .need help

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  • Abdul Haq
    Abdul Haq Nov 14, 2018

    please provide the generator controller model i mean which controller is installed.

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I would think the coolant level safety feature triggers the fault and /or parameters set up or programming.

Posted on Dec 19, 2018

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There might be two reasons for the failure of generator auto start.

1. It is the ATS automatic conversion control device that does not issue the start generator command after the mains power failure or phase loss operation, or the self-starting relay failure, which causes the generator to not start itself. This situation is relatively rare.

2. It is the generator start battery failure, and this kind of situation is relatively more.

Posted on Dec 19, 2018

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Posted on Jan 02, 2017

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SOURCE: 1975, 7.5 Kohler marine genset, runs only with the reset depresed

Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

Posted on Jun 12, 2010

  • 12 Answers

SOURCE: I have a Kohler 12RES, 12.5kw genset. Less than a

Replace mag pick up. Cranking voltage on the MPU should be at least 2 volts AC. Normally MPU goes out.

Posted on Nov 29, 2012

  • 12 Answers

SOURCE: 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.

Posted on Nov 30, 2012

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My 3.5 kw kohler marine gen starts and shuts right off throwing code uu (under voltage) last season it did this and sometimes showed loc (loss of coolant) but never appeared low or showed sign of coolant...


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).

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I have a kohler 5E marine generator It will blow the input fuse when cranking. If the voltage regulator is disconnected it will start but only run if the start switch is pressed. Any Ideas?


I have the same genset. Just fixed a similar prob with it. Mine would intermittently blow fuses at first then started blowing them as soon as trying to start. I also saw a puff of smoke from reg when it did run at one point. Carefully check stator wires for shorts to ground. Make sure to lift the stator wires that are grounded in control box. If no grounds replace control board and reg board. $400+. Cross your fingers and try it. Mine worked, thank God. The pc boards are marginally designed and built. The relays, diodes and other componants are way too undersized for the application and can not survive a lot of cycling
on and off. When starting genset make sure to slowly apply loads to it. Same thing when shutting it down. Dont shut it down with any load. It wont take it
Good luck

Feb 15, 2011 | Electrical Supplies

1 Answer

1975, 7.5 Kohler marine genset, runs only with the reset depresed


Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

May 26, 2010 | Kohler Electrical Supplies

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 -...

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I have a Kohler 12RES, 12.5kw genset. Less than a


check connections on speedsensor or take down rpms must be a screw or bolt on de fuelpump

Jan 25, 2010 | Kohler 12 kW Emergency Power System -...

1 Answer

Hello, I have a Kohler Marine Generator that says OC on the menu when I try to start it. Any ideas?


OC stands for Over Crank. How long does it take before the genset starts?

Apr 20, 2009 | Electrical Supplies

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