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The Bard 8408-032 defrost thermostat (32/45) is an OEM temperature-activated switch used in Bard heat pump defrost circuitry to help ensure the system initiates and terminates defrost under the correct coil temperature conditions. When a Bard unit is struggling with ice buildup or inconsistent defrost operation, replacing a failed or out-of-calibration defrost thermostat like 8408-032 can help restore reliable heating performance and protect the outdoor coil during cold weather. Match this part by Bard part number and verify application by model and serial to confirm correct fit before ordering.