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The Bard 8408-012 defrost thermostat (32/57) is an OEM temperature switch used in Bard heat pump defrost circuits to help manage when the system can initiate and terminate defrost based on coil temperature. When this thermostat is operating correctly, it supports reliable defrost performance by allowing the control to clear frost buildup while preventing unnecessary heating once the coil warms to the cutout point. If you are troubleshooting repeated icing, nuisance lockouts, or poor heating performance during cold weather, replacing a weak or out-of-calibration defrost thermostat with the correct Bard 8408-012 part is a straightforward way to restore proper defrost control and maintain factory-intended operation.