LG LSC121PMA Split System Air Conditioner "year c6" Questions

Lg Unit Lan095HV it is a split unit The code C6 unit won't work.It has not work right since I purchased a year ago and had to Have it serviced still not working! What does C6 mean? Is it an error code

...SPLIT UNIT, It was already installed in our house upon us purchasing it, it would be approx 3 years old, has been pretty much running 24/7 and has been great up until recent, about 6months ago ...

...would never buy a split system with an inverter ever again too many problems. Lucky for me I have 5 years extended warranty.The technician gave me a tip and said to clean the filter every 2 weeks if ...