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Bard K920-30-1 is an OEM Marvair fan control board used in Bard wall mounted air conditioners and related equipment to manage indoor fan operation based on unit control signals, helping the blower run when it should and at the correct time during cooling or heating calls. When a unit has intermittent fan operation, no fan response, or erratic cycling, replacing the correct Bard factory board is often the cleanest fix because it restores the original control logic and electrical connections. Match this board to your unit model and wiring diagram before ordering, and transfer each wire to the same terminal locations for a proper, reliable repair.