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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?

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  • 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?

    Thanks,

    George

  • 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.

    Thanks,

    George

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Hi,
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...

heatman101

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...


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