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Bard part 5650-038 is an OEM reversing valve assembly with a 24V coil and 3/4 x 1/2 inch nominal connections, used in Bard wall-mounted heat pump units to shift refrigerant flow between heating and cooling modes. If your system is stuck in heat or cool, will not change modes, or you have verified proper thermostat and defrost control signals but the unit still will not switch, a failed or sticking reversing valve can be a common root cause. Replacing with the correct Bard valve helps restore proper changeover operation and refrigerant routing while maintaining factory fit and performance expectations; always confirm your unit model and revision, and follow proper refrigerant recovery, brazing, evacuation, and leak-check procedures during installation.