A defrost heater is a component of a refrigeration system that prevents frost and ice buildup on the evaporator coils. It is typically a heating element that is energized during the defrost cycle to melt any frost or ice that has accumulated on the coils.
A properly functioning defrost heater is important for maintaining the efficiency of a refrigeration system. Frost and ice buildup on the evaporator coils can restrict airflow, which reduces the system’s ability to cool. This can lead to increased energy consumption and premature failure of the compressor.