Question about LG Art Cool LA181CNW Split System Air Conditioner

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Installed LG split system. The unit does not

Installed LG split system. The unit does not work. Tested voltage good on both L1 and L2 - 120 volts - #3 is the low voltage com line - reads 0 volts, should be 20-70 volts +/-. Replaced PCB, still nothing - Distributor sent new indoor unit, and still nothing - the outdoor unit fan will not start when I start the indoor unit - still get 0 volts on line #3. Any suggestions?

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Any chance that you've got L1 and L2 hooked up to the same leg of the main? That would still give you 120 on each but not 240 from L1 to L2 like it should be. I'm not familiar with the LG system, but I would think that a comm line would have two wires.

Posted on Jul 14, 2010


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This video demonstrates how to check a battery for proper voltage before replacing it. In the video examples the battery has been removed from the unit, although a battery can be tested while on or off the unit.
Tools Needed: Volt Meter
Testing a Battery
  • You will need a meter that can test DC voltage. There are many possible battery ratings such as 6 VDC, 8 VDC, and 12 VDC. Ensure that your meter is equipped with a compatible DC volt range for the battery being tested.
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  • Place the red lead of the meter on the positive terminal of the battery and the black lead of the meter on the negative terminal of the battery.
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Once you verify you have a good battery installed it is highly recommended that the charging system of the unit be tested to prevent future battery problems. In most cases taking a reading with the battery installed, while the unit is in operation will prove the functionality of the charging system. This is not possible on all units for safety reasons.
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I am working with a Dayton 2YU39. The name plates states that it has to be powered by 208 volt system. There's a 3-phase panel and a single-phase panel. The 3-pahse panel L1 to ground is 118 volts. L2 is a...

Here's what I think but you will have to check it out...
The fan motor in the 39 heater is a 120V fan there fore it cannot be hooked to the 240 which potentially could have the high (wild) leg as one of the fan legs...
The 240V 36 unit probably has a 240v fan motor....
Now if you were to make sure that the leg that fed the motor was a 120V to ground leg then you will be okay...
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We purchased a Amcor Amcoraire Mini Split Unit ? 12000BTU However the Power Transformer Input: AC115-120v 60hz Output: 10.5v 550mA isn't working as per the installer and we can't seem to find it...

Hi, this is a 1-ton cooling unit per your numbers. If they just installed it and the line side (120 volts) is good but nothing on the secondary low voltage side, they should have replaced the transformer themselves? If it is a split system, it is normally on all splits to be located in the indoor unit control section. I can't tell you exactly, but look where the 120 volts come into the indoor unit and the high voltage wiring should be connected to it then stepped down to lower voltage. It may have a fuse on the circuit board that they blew when installing it. If you are not familar with electrical, I wouldn't attempt to make these repairs. You can look for a small plug in type fuse to see if it blew, it looks like one on your automobile. I would call this installer out and its there job to do this!! These transformers look different, there not all the same, but will have a black and white wire coming in, and several colored wires coming out for low voltage. It will be in the indoor unit. Keep me posted on what you find or if you need more help. How long ago was the unit installed?

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Voltage,168 is low,sounds like a 208 volt unit or 220 volt.running at 168 or 198 ac volts is going to raise the amperage causing the compressor to run hot and work harder and soon burn up,And cause it to trip the breaker or shut itsself down on high heat.Your going to need to get that voltage fixed.I dont know why it needs a stabilizer if the unit was sized correctly it shouldnt need one.
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This is the main PCB diagram of the indoor unit of LG LS-K1830 model.526bf5a.jpg

  • Check the shown capacitor. Lift one leg then connect the test leads of the ohmmeter to the capacitor terminals. Do the same with the test leads in reverse. The pointer should deflect quickly to the right then slowly deflect back to the left on both instances. Otherwise the capacitor is bad and must be replaced with the same specifications.
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  • Check the voltage between the labeled terminals of the 5-pin connector shown above. The voltage should be about 17 volts. If voltages is below 17 volts or not present, check the connection between the indoor and outdoor unit main boards. If connection is good, replace the outdoor unit main board.

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I hope it helps.

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