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Bard part number S5650-045 is a 24V reversing valve assembly described as a 3-way valve with a molded plug, used in Bard wall-mounted heat pump systems to route refrigerant flow during heating and cooling changeover. When a unit will not switch modes, has inconsistent heating or cooling performance, or shows valve related operational issues, replacing the reversing valve with the correct Bard OEM component helps restore proper system operation and electrical connection integrity at the valve coil. Verify the exact model and serial compatibility before ordering, since reversing valve configurations and harness connections can vary by unit family and revision.