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Bard part number 8301-112-001BBX is an OEM programmed UPC3 IPv6 controller board supplied boxed, built to replace the earlier 8301-112-001BX and restore proper unit operation when a control failure, communication issue, or damaged electronics takes a Bard wall-mount system offline. As the primary controls component, this board coordinates normal heating and cooling functions and handles system monitoring and fault information that technicians rely on during service. Because it is factory programmed, matching the exact Bard part number 8301-112-001BBX to your unit and existing control setup is critical before ordering, and if you are unsure of compatibility, verify by model and serial against the correct Bard literature.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.