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The Bard 8201-166 Fan Logic Control is an OEM control module used to manage indoor fan operation in compatible Bard wall mounted HVAC systems, helping the blower respond correctly to system calls and timing so airflow stays consistent through cooling or heating cycles. If you are troubleshooting symptoms like improper blower sequencing, fan not running when it should, or fan operation that does not match the call, replacing the 8201-166 with the correct Bard OEM part helps restore factory intended control logic and electrical compatibility. Confirm the exact unit model and wiring configuration before ordering, since Bard control components can be application specific and must match the original part number for proper fit and safe operation.