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The reversing valve coil is an electromagnetic coil that actuates the reversing valve in heat pump systems, switching between heating and cooling modes. When energized, it shifts the valve to change refrigerant flow direction. This coil is essential for the proper operation of reversible boiler or burner systems that provide both heating and cooling. A faulty coil can cause the system to get stuck in one mode. Replacing it ensures your heat pump functions correctly throughout the seasons.