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Bard part 8602-043 is an OEM thermistor sensor used in Bard wall mount HVAC equipment to monitor temperature and report that signal back to the unit controls, helping the system make correct decisions for cooling, heating, defrost logic when applicable, and protective safeties. When a thermistor drifts out of calibration or fails, it can cause nuisance lockouts, incorrect staging, or erratic operation, so replacing it with the correct Bard sensor is the best way to restore accurate temperature feedback and maintain proper unit performance. Match the part number to your model and serial specific parts list to confirm application and sensor location before ordering.