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Bard part 8201-055 is an OEM heat pump control (manufacturer reference 621-1230) used in Bard wall mounted heat pump equipment to manage key heating and cooling control functions and keep the unit operating in the correct mode. If your system is experiencing intermittent operation, improper changeover, or control related lockouts, replacing a failed control with the correct Bard OEM part helps restore proper sequencing and reliable performance. Match this part number to the unit model and wiring diagram in the service literature before ordering to ensure correct fit and operation.