Gennadiy G Brookline , MA February 14, 2017 Appliance: Model SUMMIT FF1410W My summit refrigerator did not go to defrost cycle evaporator coil had a lot of ice built on the coil which cause lack of efficiency for refrigerator Installed defrost timer part # AP4246797. Machine screws included are useless.Should be secured with original sheet metal screws. Needed to cut some plastic to allow timer seat perfect in dedicated space. Good quality timer, seems working fine 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes