Error code uu=low voltage
SOURCE: UU lowvoltage error code residential generator
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?
SOURCE: I have a Kohler 12RESM1 propane generator with oc/uu code
I am getting the same exact problem and errors with my 12RES Kohler generator. It will try to start using a remote switch but fails. Then it will start using the switch at the generator. The error code it comes up with using the remote start switch is usually OF or UU. It is less than a year old. Can Kohler Help??? Dave R.
SOURCE: I have a kohler 5E
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
SOURCE: my 3.5 kw kohler marine
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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