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Bard part S127-312-6 is an OEM thermostat base assembly with built-in timer and humidity (humidistat) functions, designed as the correct control mounting and interface base used with compatible Bard wall-mount and packaged HVAC thermostat/control setups. When the original base is damaged, worn, or intermittent, replacing it with the proper Bard base helps restore reliable scheduling and humidity-related control signals so the system can run as intended. Confirm compatibility by matching the full Bard part number and verifying the thermostat/control family used on your unit, since similar Bard bases can differ by function and faceplate color.