Carl A Mountain View , AR June 30, 2015 Appliance: Frigidaire Freezer FFU20FK1CW0 Frigidaire Freezer Ffu20fk1cw0: Would not get cold. How to replace Freezer Defrost Thermostat. Replaced defrost thermostat, defrost timer and compressor controller (shotgun method). Took about an hour. Worked as soon as I plugged it back in. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes