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Bard part 904-0600BX is an OEM reversing valve assembly for Bard heat pump wall-mounted HVAC equipment, built to redirect refrigerant flow so the system can change between heating and cooling operation. If your unit is stuck in one mode, short cycles, or shows performance issues tied to the changeover circuit, replacing the reversing valve assembly can restore proper mode switching when commanded by the thermostat or controls. Because this component is part of the sealed refrigerant system, installation typically involves refrigerant recovery, brazing, evacuation, and correct recharge, so it is best handled by a qualified HVAC technician to ensure proper fit, reliable operation, and long-term system performance.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.