Question about Heating & Cooling

1 Answer

LG Artcool Problem We have an LG Artcool Inverter, it runs on test mode (Lo on display), it appears to run fine on cool mode although room temp is only 17degrees, so compressor doesn't kick in. When switched to heat mode, which would be really nice right now, it does nothing and just shows the defrost light on the display. Any ideas?

Posted by on

  • George Hare Jun 01, 2011

    It just stays on defrost. I have also discovered that by using my wifes hair dryer, if I warm up the coil sensor on the indoor unit I can make it come to life and start heating. However, once it reaches temperature it goes to defrost again and doesn't cycle back on once the temperature drops again.

    In the control unit outside, there are a couple of low voltage regulators, one of which is fed from a transformer that is switched by a relay. There appears to be no output from this regulator, is this the problem relay you mentioned?



  • George Hare Jun 05, 2011

    Well, done some more investigation today. While it was nice and warm in the house today, I put it onto cool mode. The indoor unit seems to run, the fan at least! But the compressor doesn't, so it just circulates warm air rather than cooling? The intake temperature thermistor appears to be doing the right things, I have put a meter on it and as I warm it up the resistance goes down and visa-versa, and it seems to turn the unit on and off it I change the temperature with the hair dryer. Do you know what the comms protocol is that runs between the indoor and outdoor units and what messages I should expect to see going backwards and forwards? I can probe the tx and rx comms pins in the outdoor unit with an analyser and see what is going on if I knew what messages to expect and their format.




1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 43,501 Answers

There is a problem with a sensor on the outdoor unit...the sensor is telling it that the outdoor coil is frosted over and it is trying to defrost it. If you leave it on does it eventually run or does it just stay is defrost mode??? The defrost cycle could take up to a half an hour...if it takes longer then it could also be a board problem... there may be a bad relay in the board...


Posted on May 28, 2011

  • D. Floyd Kolb
    D. Floyd Kolb Jun 01, 2011

    Ok... the indoor sensor (thermistor) has gone bad or the indoor board is bad... I would replace the sensor first and then the board if that does not work...the sensor should be much cheaper...


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

LG Fridge not cooling refrigerator (freezer is fine, fan is running)

those sensors do fail but if the freezer is not as cold as it should be .then the refrigerator part will also not get proper cooling . TEST the freezer temp .

Sep 25, 2015 | LG Refrigerators

1 Answer

I dont want all those setting i want to set to a temp and the a c starts and cools to that temp and shut down how do i do that

on the remote , switch the machine on and then press the temp button to the temp that you want
remember the lower the setting the longer the machine will run and the more often it will cycle
recommended setting for maximum power saving is 25 Degrees and i have been running an ac at that for 15 years
I have had to replace it with a inverter system and have found that the system removes all the humidity from the room and so a setting of 27 degrees is more pleasant
I have noticed that although inverters run the compressor all the time (it is the load that varies) there have been times when the outside temperature fell below the set temperature and the compressor actually stopped until the room exceeded the set temperature.
so turn off all the settings not needed and simply switch on the machine and set the temp desired by the remote.

May 08, 2015 | Heating & Cooling

1 Answer

Purchased a couple of months ago. No problems with operation or cooling. Does a great job of colling the room and even risidual rooms on that level. Turned unit off while on vacation for one week. Upon...

When the environmental temperature is lower than the set range, the display will indicate "LO".
Lowering the temperature you have it set on, should resolve the problem.

Hope this helped you and thanks for choosing FixYa.

Aug 21, 2011 | Haier CPRB07XC7 Portable Air Conditioner

2 Answers

I have a split system model ls-k2464hl the remote works but will not turn on the unit.The unit will force run but only in cold

It sound like a defective receiver pcb. Have this professionally checked. I take the time to help, so please rate me!

Jun 15, 2010 | LG LS-K2430HL Heat Cool Mini Split Air...

2 Answers

Penguin model 610012-001a/c compressor won't start

I would check to make sure that the control is sending the "cool" signal to the control unit. LO on the room temp display usually means that the fan speed is set to low. Is LO and Auto showing on the display at the same time. Try resetting the thermostat first. Hold down the Mode and Zone buttons with the tstat off. While holding them down, turn the tstat back on and hold the buttons down until FF appears on the screen. Release the buttons and try the AC.
If this does not work, on the control board is a freeze control switch plug (blue usually). Try unplugging this unit and insert a small jumper wire. If the Compressor comes on and runs then you have a bad freeze control switch. If not, then you should replace the control board.

Hope this helps,


Jun 23, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

Dometic refrigerator inconsistent temperature

Yes the clearances on gas absorption frig is critical. Not to say there is not another problem. Is the thermister attached to the frig fins?

Mar 01, 2009 | Dometic RM2852 Refrigerator

1 Answer

Lg split indoor fan runs non stop

Hello Hamid,
The unit is designed to run the indoor fanmotors continuously when in cooling mode on both indoor units (evaporators). The reason is that this circulates the air and the temperature thermistor or sensor is able to sense return air temperature and in turn start or stop the outdoor unit and compressor as required according to the setpoint temperature. The reason for either unit not reaching setpoint temperature can be a couple of reasons. A) Incorrect design - the unit may be too small for the application. You can calculate this roughly at 650BTU per square meter of room in a relatively warm ambient climate. Or secondly B) The outdoor unit has leaked and is short of refrigerant. You can check this when the outdoor unit is running by feeling the thicker copper tube on the right hand side of the unit. This should be cool to cold. If no temperature difference is felt, it is short of refrigerant. Hope this helps you. Goodbye

Aug 11, 2008 | LG LS-L1210CL Mini Split Air Conditioner

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

196 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts


Level 3 Expert

2461 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides