The Defrost Heater is an OEM part for Frigidaire refrigerators. This component is responsible for melting away frost and ice that accumulate on the evaporator coils during the refrigerator's cooling cycle. The defrost heater activates periodically, ensuring that air flow remains unrestricted and the refrigerator can efficiently maintain its set temperature.  Causes for replacement can include a burnt-out heater element, damage to the wiring, or a malfunctioning thermostat that fails to initiate the defrost cycle. These issues can lead to reduced cooling efficiency, increased energy consumption, and potential spoilage of stored food due to fluctuating temperatures. Symptoms of a bad Defrost Heater include: Frost and ice accumulation on the evaporator coils beyond normal levels. The refrigerator or freezer sections are too warm due to blocked air flow. The refrigerator is cycling on more frequently or for longer durations This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.5303918410 (AP4455011) replaces 1533034, 75303918410, AH2369212, EA2369212, PS2369212.