Kenneth C Bellefonte , PA February 14, 2016 The evaporator on my refrigerator kept freezing up After some discussion with an agent at Appliance Parts Pros and help with diagnostics, I determined the defrost heater had failed. I purchased a defrost heater, installed and it is now working well. 7 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours