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Bard part number 8408-002 is an OEM defrost thermostat used in Bard wall mounted heat pump defrost circuits to help prevent outdoor coil icing by opening and closing based on coil temperature. The 32/57 temperature rating indicates the approximate cut-in and cut-out points used to control the defrost function so the unit can return to normal heating without nuisance ice buildup. If you are diagnosing repeated frosting, long defrost cycles, or no defrost operation, replacing the thermostat with the correct Bard 8408-002 is a dependable way to restore proper defrost control and ensure correct fit and wiring compatibility with Bard equipment.