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Bard part 905-0503 is a heating expansion valve assembly used in Bard wall-mounted heat pump systems to meter refrigerant and maintain proper evaporator superheat during heating operation. When an expansion valve sticks, plugs, or leaks, you can see poor heating capacity, unstable pressures, coil icing, or nuisance safeties, and replacing the valve with an OEM assembly helps restore correct refrigerant control and system performance. Because expansion valve sizing and application vary by model and refrigerant, confirm 905-0503 against your Bard unit model and serial number or the unit parts list before ordering, and have installation performed by a qualified technician since it involves sealed-system work.