Jeff T Chandler , AZ May 23, 2022 Appliance: General Electric Refrigerator ZISW42DYB Ge Refrigerator Zisw42dyb: Defrost timer was noisy. How to replace Refrigerator Defrost Timer. Unplugged the appliance and removed the cover to get access to the part. Removed the two screws and unplugged the timer. Plugged in the new timer and screwed the part back in place. Reinstalled the cover and plugged in the refrigerator. Now it is back to running quietly and efficiently. This was the easiest repair I have ever done. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes