How do I reset the water filter indicator after replacing the water filter?
Press and hold the LIGHT/FILTER button for more than 3 seconds to reset the filter indicator after the water filter has been replaced. It is recommended that you replace the filter when the water filter indicator light reaches 0 or whenever the water or ice cube taste deteriorates noticeably. (Page 20)
From the official LG Refrigerator manual, page 20
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