William M Phoenix , AZ July 26, 2017 Appliance: Frigidaire Refrigerator FTHD18P4KW0 Frigidaire Refrigerator Fthd18p4kw0: Refridgeator running all the time. How to replace Refrigerator Defrost Timer. Replaced defrost timer Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes