I have a really frustrating problem which I hope someone can help me with. I'm servicing a LG LSK244V-3 split reverse cycle air con. The problem is that the unit will not cool but it will heat fine. When cooling is selected the compressor turns off, the outdoor fan runs occassionaly, the indoor fan runs as normal, then after about 5 minutes the entire unit switches off and display 6 flashes of the indoor and outdoor power LED.

I have checked the following:
* Basic stuff, fuses, connectors, visibly damaged components on all PCBs etc.
* Compressor is OK. (confirmed by DVM and also the fact that heating is OK).
* Reversing solenoid and slider OK.
* Voltage to the compressor is OK and balanced.

Any suggestions at all?

cheers - Lee