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Bard part number 8301-076-002GBX is an OEM UPC3 controller module (programmable logic controller) used on Bard MEGA-TEC wall-mount air conditioners to manage unit staging, safeties, and overall operating logic. This programmed, boxed replacement is built to match Bard control specifications and is intended to restore proper communication and reliable system operation when a failed or corrupted controller is causing faults or erratic performance. Because UPC3 replacements are software-version dependent in Bard documentation, confirm the exact unit model and required controller revision before ordering and plan on updating site software as needed so the replacement controller and connected equipment operate correctly.