In Auto mode, and jet cool or fast cool (if option is there in your remote), you can't change speed. Keep cool mode and then press fan again and again still you get required speed. Suppose, as you said beep sound is there when you select speed, check related speed terminal in PCB. If power is there, winding open in motor. If no power, replace/repair PCB. Thanks and hope it's helpful.
My Lg jet cool unit get started and after every one minute its compressor get off and again start then ten to fifteen minute and again then run hardly one minute then off.
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