Our LG split AC is showing a CH code on the display, how do we read what it means and which ones can we actually deal with ourselves?

Good question, on LG the CH code is the unit telling you which area the fault is in, and LG publishes what each one means, so the trick is to read the code and match it to LG's own list before anyone opens anything. A few of the common ones: CH61 usually means the indoor unit is overheating from poor airflow, very often just a clogged filter, and CH04 means condensate isn't draining, both of which you can reasonably check first (clean the filter, check the drain). But CH05 is a communication error between the indoor and outdoor units, CH38 means it's low on refrigerant, and the pressure/relay codes are sealed-system faults, those are technician jobs, not DIY. So the honest split is: filter and drain codes, have a look yourself; anything pointing at refrigerant, the outdoor unit, the board or communication, get a professional, because 'low on gas' means there's a leak to find, not just gas to top up. If in doubt, note the exact code and book AC repair in Dubai rather than resetting it repeatedly, a code that keeps coming back is a real fault. (The code meanings here are from LG's own support pages.) Got a different brand? See Mitsubishi Electric, Panasonic, Hitachi and Haier error codes.