Dennis D Incline Village , NV December 15, 2025 Appliance: General Electric Refrigerator ZISW42DYB Ge Refrigerator Zisw42dyb: Refrigerator stopped working tried advancing the defrost timer manually and the units started running. How to replace Defrost Timer. Replaced the defrost timer with a new one. Problem solved Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes