dynamic appliance repair Upon receiving a call about a Subzero built-in refrigerator not cooling, I began by inspecting the appliance's exterior and interior components. The refrigerator's condenser coils were clean, and the fan was operating correctly. I then checked the temperature settings and found them to be accurate. Next, I examined the evaporator fan motor, which was functioning properly. I proceeded to inspect the sealed system for any refrigerant leaks, finding none. I then tested the defrost system, discovering that the defrost heater was faulty. After replacing the defective defrost heater, the refrigerator began to cool as expected. The customer was pleased with the resolution and the appliance's restored functionality.