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Bard part 8201-112 is an OEM heat pump control sensor used by the unit controls to monitor operating conditions and help the system make correct heating and defrost decisions. When a sensor drifts out of tolerance or becomes intermittent, Bard heat pump units can show nuisance lockouts, improper defrost timing, or unstable heating operation, so replacing it with the correct Bard sensor helps restore reliable control and protect critical components. Match 8201-112 to your exact Bard model and wiring diagram before ordering, since Bard uses multiple sensors and harness styles across product lines and revisions.