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Bard part number 8301-112-001ABX is a factory-programmed UPC3 IPv6 unit controller board supplied boxed, built to restore proper equipment operation when the original control fails or is damaged. As the OEM control module used in Bard HVAC applications, it manages critical unit functions and supports onboard diagnostics and communication needed for reliable service and troubleshooting. For the best fit and to avoid setup issues, match the exact part number and programming to your unit model and control configuration before ordering, since programmed controller variants are not always interchangeable across series.