Elmer E Gays Creek , KY October 05, 2014 Appliance: Roper Refrigerator RT14DKXYW00 Roper Refrigerator Rt14dkxyw00: The refrigerater wouldn't get cold because it wouldn't defrost. How to replace Defrost Bimetal. I followed the appliancepartspros instructions on how to diagnose the problem and the defrost bimetal thermostat checked bad. I followed the installation instructions and so far the refrigerator is working correctly. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes