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Bard part S912-0045 is an OEM fan and limit assembly used on Bard heating-equipped HVAC units to manage blower fan operation and provide temperature limit protection. This control helps bring the indoor blower on at the proper time and shut it off after the heat cycle while also safeguarding the unit against overheating, which supports reliable operation and helps prevent nuisance trips when the system is set up correctly. If you are replacing a failed or drifting fan limit control, match the part number S912-0045 exactly and confirm wiring and mounting details against your Bard unit documentation to ensure proper fit and safe operation.