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Bard 8201-093 is an OEM heat pump control sensor used in select Bard wall mounted HVAC and heat pump units to provide the control circuit with a critical temperature or operating condition input so the system can sequence heating and cooling functions correctly and protect the equipment during changing outdoor conditions. When this sensor is out of range or intermittent, you can see erratic heat pump operation, nuisance lockouts, or improper changeover behavior, so replacing it with the correct Bard OEM sensor helps restore stable, factory intended control performance. Verify the part number against your unit model and serial, and confirm the sensor location and wiring connection style before ordering to ensure proper fit and correct readings after installation.