OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY2PNB048115AA

This OEM single run capacitor (Part# P291-0403) is the factory-specified replacement for the Carrier PY2PNB048115AA packaged unit. The run capacitor maintains the continuous phase-shifted current required to keep your condenser fan motor or blower motor spinning efficiently. When this capacitor weakens or fails, common symptoms include a motor that hums but refuses to start, intermittent shutdowns on hot days, or a tripped high-pressure safety limit due to reduced airflow. Left unaddressed, a failed run capacitor can overheat and permanently damage an otherwise healthy motor.

• Specs: 4 MFD (microfarad) | 370V rated | Oval case | 50/60 Hz | Factory-matched ±5% tolerance | Replaces HC90AA004, HC91CA004, HC90AB004
• OEM vs Generic: This is a genuine Carrier / Totaline OEM capacitor, manufactured to exact factory tolerances. Generic aftermarket units often deviate ±10% MFD, accelerating motor bearing wear and shortening compressor service life. OEM is the correct choice for warranty-covered equipment.
• Install difficulty: 2/5 — Always discharge the capacitor before handling any terminals. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance mode). Photograph all wiring before disconnecting. Note: P291-1503 (15 MFD 370V, secondary run capacitor on this model) has been discontinued — its current successor is P291-1504 (440V, 15 MFD).
• Warranty: 1-year OEM factory warranty. In-stock and ships the same business day from our warehouse.

Compatibility: Fits Carrier model PY2PNB048115AA packaged HVAC unit. Verify the MFD and voltage rating on your unit's data plate before ordering. This listing is for the primary P291-0403 (4 MFD 370V) single run capacitor. A second run capacitor on this unit uses Part# P291-1503 / P291-1504 (15 MFD). Have a fitment question? Our HVAC parts specialists verify compatibility before you order — reach out before you buy.