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Bard part number S912-0048 is an OEM fan and limit assembly used in Bard heating sections to control blower operation based on temperature while also providing high limit protection if the heat exchanger or plenum gets too hot. When this control is weak, miscalibrated, or sticking, it can cause delayed blower start, short cycling, or nuisance limit trips, so replacing it with the correct Bard assembly helps restore normal heat timing and safety shutdown protection. Match this part to your unit model and wiring diagram to confirm the correct style and mounting for your specific Bard equipment before ordering.