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This is the factory-specified OEM single run capacitor for the Carrier PG8MAA066110ADJA gas furnace. The run capacitor provides the sustained electrical charge required to keep the blower motor running at full efficiency once it has started. When this capacitor degrades or fails, you'll typically notice the blower motor humming without spinning, starting sluggishly, overheating and tripping the thermal limit, or the furnace short-cycling due to airflow faults — all classic signs of a weak or dead run capacitor.
Compatibility Note: Designed for the Carrier PG8MAA066110ADJA gas furnace. OEM part number P291-1003 (superseded by P291-1004). Cross-references include HC90BB010, HC91DA010, and HC90AB010 among others. Verify the 10 MFD and 370V ratings on your unit's capacitor label or data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and we'll ship your part the same business day.