Marty C Gastonia , NC December 03, 2023 Appliance: Estate Refrigerator TT14DKXKQ01 Estate Refrigerator Tt14dkxkq01: Freezer section kept getting ice buildup & drinks in fridge portion was freezing up. How to replace Refrigerator Defrost Timer. Changed the wiring harness in the freezer. It’s the only way to change the bi-metal switch that controls the heating elements. Changed the defrost timer just in case. Had to watch a video on YouTube because there were no directions for the defrost timer. This made the project take longer. That’s when it would start freezing up. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes