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8612-040A OBSOLETE
- MC4000 MAIN CONTROLLER BOARD
The Bard 8612-040A MC4000 main controller board is an OEM control component used in Bard MC4000 series lead lag controller systems that manage two wall mount air conditioners or heat pumps for staged heating and cooling, equipment rotation, and coordinated fan operation. This board provides the low voltage terminal connections and onboard control logic that powers and isolates 24 VAC inputs from each unit to prevent backfeed or phasing issues while delivering reliable control outputs for common HVAC calls like G, Y1, Y2, and W. If your MC4000 controller has intermittent operation, failed outputs, or damage at the terminal strip or electronics, replacing the Bard 8612-040A helps restore proper sequencing and stable system control while keeping your setup matched to Bard factory specifications.
Official replacement(s):
8620-237
- MC4000 Board Replacement Kit