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The Bard 5650-021 reversing valve is an OEM heat pump refrigerant control component that directs flow so a compatible Bard wall mount unit can change between heating and cooling operation. If your system is stuck in one mode, intermittently changes over, or will not defrost properly, a worn or leaking reversing valve can be a common cause. Using the correct Bard factory part helps ensure proper porting, dependable shift performance with the existing solenoid coil circuit, and a refrigerant-tight fit with the unit’s piping layout, so the heat pump can return to normal mode changeover and stable capacity after service.