How do I activate the Child Lock function?
Press the Timer button and Minute Set button simultaneously for three seconds to activate Child Lock mode. The operation display will show 'CL'. When Child Lock is active, the remote controller will not respond to button presses (except the Room Temperature function). Press the same buttons for three seconds again to cancel the function.
From the official LG LB-H0850QC Air Conditioner manual, page 11
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