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Bard part number 8612-009 is an OEM time delay temperature sensor used in Bard wall-mounted air conditioner and heat pump control circuits to monitor temperature and help stage or inhibit system functions with a built-in delay so the unit does not respond too quickly to short temperature swings. Replacing a failed or out-of-tolerance sensor like 8612-009 can help correct nuisance cycling, timing-related lockouts, or control logic issues that depend on accurate temperature feedback and proper delay characteristics. Confirm the part number from your Bard unit model and wiring diagram before ordering to ensure correct fit and function in your specific control application.