Model: SR324F2(W) 1. Frost timer is working(as it is rotating to complete a cycle) 2. Change the thermal fuse (75 deg C) 3. Checked ampere rating at compressor cut-off(reading = 0.5 A)during supposed to be defrost time. It seems the heater coil along with the freon coil is okey when I checked with ohm meter because there is a resistance. After a week of operation, no defrosting is happening. Based on these descriptions, where can we attribute the problem? ne414wilperpil@yahoo.com