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The Bard 8612-029BX MC3000 Controller Board is an OEM control board used in Bard lead lag control applications to manage staging and coordinated operation of compatible Bard HVAC equipment. This board is a direct replacement for older part number 8612-029 and is commonly referenced as the standard MC3000 relay/control board, making it a solid choice when you are troubleshooting a no-start, improper sequencing, or intermittent control issue tied to the lead lag controller. As a genuine Bard replacement part, 8612-029BX is built to match original electrical connections and control logic so you can restore proper system operation once you confirm compatibility by model and serial number.
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.