I didn't want to take the time for it all to thaw back there, so I unplugged it, opened the freezer and the sliding door, and waved a hair dryer around the ice for 10 minutes. Put a towel down on the floor of the unit to soak up all the water. The motor noise has stopped now, thanks to your post. But I am not going to want to do this every 6 months. We really haven't come very far since the days when my Mother would defrost her freezer twice a year now, have we Bethany? Never again will I buy a major appliance from LG. NEVER EVER AGAIN!