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CH 5 on these units indicates a communications error between the indoor and outdoor units. Generally, it will require a replacement outdoor board assembly to repair it. Lookup LG parts on the internet or ring them for your nearest Agent or parts. 800 243-0000
The pattern instructions should have a guide as to what the abbreviations mean. Pattern makers will sometimes create their own abbreviation, so it is important to read the complete set of instructions included with the pattern.
I didn't see a ch but both 5 and 11 point to high pressure. 5 is a liquid temp sensor short, 11 is high pressure error. Sounds like a bad sensor. Best Wishes!
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
I found the answer to the problem eventually,it was because when setting up the recorder I had set the clock to 2007 instead of 2008 everything now working OK
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