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Bard part number 8301-068-002J is an OEM UPC3 controller used on Bard Fusion-Tec wall-mount HVAC equipment, providing the unit level logic that coordinates normal operation, safety monitoring, and communication within the Fusion-Tec control system. When a UPC3 board fails or becomes unreliable, replacing it with the correct Bard factory controller helps restore proper staging, sensor inputs, alarm handling, and overall system control without guessing on field substitutions. Because the trailing letter identifies the software revision, confirm your unit series and control revision requirements before ordering, and plan to keep software versions aligned across the site when replacing a controller.