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The Bard 8301-112-002ABX is a factory programmed UPC3 Core 2 control board supplied boxed, built to restore proper unit operation when an existing UPC3 controller has failed or become unreliable. As the main electronic controller in many Bard wall mount and commercial HVAC applications, this OEM board handles critical control logic, system sequencing, and service diagnostics to help keep the equipment running as designed. Because programmed control boards are model and application specific, confirm the full Bard model and serial information (and any controller revision requirements) before ordering to ensure correct compatibility and avoid startup or communication issues during replacement.