OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY3PEA048090AA

This OEM Carrier single run capacitor (P291-0403) is the factory-specified replacement for the Carrier PY3PEA048090AA 4-ton packaged gas/electric unit. The run capacitor maintains the continuous phase shift needed to keep the PSC condenser fan motor or blower motor spinning at rated torque and efficiency. When this capacitor fails or drifts out of tolerance, the most common symptoms are a humming motor that won't start, sluggish motor ramp-up, intermittent shutdowns on thermal overload, or unexplained high head pressure caused by a slow or stalled condenser fan. Left unaddressed, a weak capacitor accelerates motor winding wear and can lead to compressor overheating in a packaged unit like the PY3PEA048090AA.

• Specs: 4 MFD (microfarad) | 370 VAC rated | Oval case form factor | ±5% capacitance tolerance | 50/60 Hz | UL Approved with patented pressure-sensitive interrupter
• OEM vs Generic: This is a genuine Carrier/Totaline OEM capacitor manufactured to exact factory tolerances. Generic capacitors commonly ship at ±10% MFD variance, which shortens motor life and can void motor warranties. OEM units are subjected to 100% electrical testing before leaving the factory.
• Install difficulty: 2/5 — Always discharge the capacitor before handling (use a 20,000 Ω resistor or insulated screwdriver across terminals). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance mode). Photograph all wiring connections before disconnecting. Verify MFD and voltage ratings match your unit's data plate before installation.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed for Carrier model PY3PEA048090AA 4-ton, 90,000 BTU packaged gas/electric unit. Also cross-references OEM part numbers P291-0403 (primary) and may be used alongside companion capacitor P291-1503 (15 MFD 370V) for the fan motor circuit — verify your unit's wiring diagram to confirm which circuit each capacitor serves. Cross-references include HC90AA004, HC91CA004, HC90AB004, GE/Genteq C304L, and 27L571. Questions? Our technical team confirms fitment before you order.