Michael H Ofallon , IL June 10, 2018 Appliance: Model 2000 WHIRLPOOL Not defrosting, warm inside fridge. Determined the defrost timer was still working but defrost heater was not kicking on. I figured probably the bi metal defrost switch was out, so replaced it and been working fine ever since. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes