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The Bard 5651-159BX is an OEM integrated furnace control board used in Bard wall-mounted gas/electric HVAC equipment to manage the furnace operating sequence and coordinate key heating functions through the unit’s control panel. This part is listed as the direct replacement for Bard 5651-159 and is commonly referenced in Bard wall mount gas/electric service literature as the integrated furnace control, making it the correct choice when you need to restore proper heat operation, ignition timing, and reliable system control after a failed or damaged board. Verify compatibility by matching the part number and your unit model and serial information before ordering, since control boards are model-specific and wiring layouts can vary by series.
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.