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Bard part 8408-005 is an OEM outdoor thermostat with a 0 to 30 degree Fahrenheit operating range, used on select Bard wall mounted HVAC and heat pump applications to help control temperature dependent functions such as low ambient operation and staging logic. When this outdoor thermostat is out of calibration or has intermittent contacts, you can see nuisance lockouts, improper low temperature operation, or inconsistent system response, so replacing it with the correct Bard OEM part helps restore proper control operation and dependable performance. Match the part number 8408-005 to your unit model and wiring diagram before ordering to confirm correct application and setpoint range for your specific configuration.