Hi everyone, does anyone know what fault code CH 76 means? I rang LG and they said their codes end at CH 73!

The story goes: I switched the AC off at the breaker so I could rewire a zone motor (which is separate from the AC, just steals power form the interconnect) as some peanut had wired it up in reverse and when we turned the unit back on the display shows CH76 and won't do anything else. Yes I know LG are the worst AC's in the world and so does my mate who owns it hopefully someone has seen this before. Unfortunately the previous owner had installed it in the house to sell it. God LG's and Midea's are the worst AC's ever. I call them the landlords special