Daniel K Castalia , OH April 15, 2017 Appliance: Amana Refrigerator BC20J Amana Bottom-Mount Refrigerator Bc20j: Refrigerator kept icing up causing low temp in refrigerator compartment. How to replace Refrigerator Defrost Timer Assembly. Tested for faulty defrost timer, replaced it 7 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes