SOURCE: C4 error code on LG artcool airconditioner
www.yx2.fi/LG/wall_and_art_cool_error_codes_2007.pdf
Please read this article, I think it will help you solve your problem
SOURCE: LG air conditioner model LG LP1210BXR
Well it needs to be fix by a professional, so if you or someone you know are good at tinkering go for it. It as a sensor problem at the evaporator.
SOURCE: LG air condotioner with a CH5 error code
CH-05-Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4
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