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8612-040 OBSOLETE
- MC4000 Main Controller Board
The Bard 8612-040 is the OEM controller board used in the MC4000 series master controller to manage lead-lag staging and coordinated operation of two Bard wall-mount air conditioners from a single control system. This main control board handles the controller’s core logic for heating and cooling calls, alternating sequence options, sensor inputs, and interface functions such as fire/smoke shutdown, helping restore reliable redundancy and proper changeover between units when the original board fails. As a genuine Bard replacement, 8612-040 is intended to match factory wiring and programming requirements for MC4000 controller assemblies, making it the right choice when you need a direct-fit board replacement rather than a generic control that may not support the MC4000 feature set.
Official replacement(s):
8620-237
- MC4000 Board Replacement Kit