Joel S Tomahawk , WI August 13, 2016 Appliance: Jenn-Air Refrigerator JTB2188AEA Jenn-Air Refrigerator Jtb2188aea: Broken defrost heater assembly. How to replace Defrost Heater (Radiant). Replaced heater 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours