DA4700244U Refrigerator Defrost Heater (3955643) — Replacement for Samsung OEM W10503278 AP6022400 This defrost heater restores the refrigerator's automatic defrost function by gently melting frost and ice buildup on the evaporator. It is a direct replacement part listed as DA4700244U and 3955643, and is compatible with Samsung OEM part numbers W10503278 and AP6022400. Use this part to bring a frostprone fridge back to reliable, efficient operation. Key benefits Restores proper defrosting: Stops excess ice buildup that reduces cooling efficiency and blocks airflow. Directfit replacement: Matches original part numbers DA4700244U and 3955643 and replaces Samsung OEM W10503278 and AP6022400 for straightforward swapin compatibility. Improves appliance performance: Returning the defrost cycle to normal helps maintain temperature stability and prevents compressor overwork. Saves time and cost: Repairing the defrost heater is a practical alternative to costly appliance replacement. Key attributes Functionality: Electric defrost heater designed to melt ice from the evaporator during the refrigerator's defrost cycle. Compatibility: Replacement for Samsung part numbers W10503278 and AP6022400; identified as DA4700244U and 3955643. Fit and form: Engineered to match original equipment specifications for correct mounting and operation. Performance: Restores the intended defrost operation of compatible Samsung refrigeration units. Typical applications and use cases Emergency : a failed defrost heater in a Samsung refrigerator exhibiting ice buildup on coils, frost in the freezer compartment, or poor cooling performance. Preventive maintenance: Install during routine appliance servicing to restore reliable defrost cycles and help maintain longterm cooling efficiency. Professional appliance : Use as an OEMcompatible replacement part in shops or by certified technicians servicing Samsung refrigerators that reference part numbers DA4700244U, 3955643, W10503278, or AP6022400. Installation and compatibility notes Confirm compatibility by checking the refrigerator's service manual or existing part number to match DA4700244U / 3955643 with Samsung OEM W10503278 / AP6022400. Intended as a replacement component for compatible Samsung refrigerators; professional installation or qualified service is recommended for safe and correct installation. Models and part numbers DA4700244U 3955643 Replacement for Samsung OEM W10503278 Replacement for Samsung OEM AP6022400 If your refrigerator lists any of these part numbers and is experiencing frost accumulation or interrupted defrost cycles, this replacement defrost heater is designed to address those issues and restore proper operation.