Nathan V Edwardsburg , MI April 07, 2018 Appliance: Whirlpool Side By Side Refrigerator ED25PEXHW01 Whirlpool Refrigerator Ed25pexhw01: Refrigerator not cooling. How to replace Defrost Timer. Replaced thermostat and defrost timer...although probably only the timer was bad but ordered both parts and replaced both as long as it was apart. About $80, a lot cheaper than buying a new refrigerator. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes