Michael R Murrieta , CA February 06, 2024 Appliance: LG Refrigerator LFX31925ST/00 Lg Refrigerator Lfx31925st/00: Ice build up on freezer back panel and fan noise. How to replace Refrigerator Control Assembly. Ice was building up on the freezer back panel and the fan was making a loud noise. Pulled the panel off to see the evaporator coils covered in ice, which was coming into contact with the fan blades. I replaced the heater and defrost control sensor. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes