OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY2PPB042090AA

This OEM Carrier/Totaline single run capacitor (part number P291-0403) is the factory-specified replacement for Carrier model PY2PPB042090AA packaged HVAC systems. The run capacitor provides the sustained phase-shifted electrical current that keeps the condenser fan motor or compressor running at peak efficiency. A failing capacitor typically presents as a motor that hums but won't start, a unit that short-cycles within minutes of startup, or a compressor that draws excessive amperage and trips the breaker. Left unaddressed, a weak capacitor rapidly accelerates motor winding wear and can cause compressor failure.

• Specs: 4 MFD (microfarad) | 370V rated | Oval case | ±5% factory tolerance | Superseded by P291-0404 (440V upgrade — direct fit)
• OEM vs Generic: This Carrier Totaline OEM capacitor is reliability-tested to 60,000 service hours, uses high-grade metallized polypropylene film, and is 100% electrically tested before shipment. Generic capacitors often run at wider ±10% MFD tolerances, which accelerates motor wear and shortens system life.
• Install difficulty: 2/5 — Always discharge the capacitor fully before handling. Tools needed: 1/4" nut driver, needle-nose pliers, insulated screwdriver, multimeter. Photograph all wiring connections before disconnecting. Capacitors store lethal charge even with power off.
• Warranty & Shipping: 1-year OEM factory warranty. UL Approved with patented pressure-sensitive interrupter. RoHS compliant. Ships same business day from our warehouse.

Compatibility: Fits Carrier model PY2PPB042090AA packaged HVAC systems requiring a 4 MFD 370V oval single run capacitor. Also cross-references OEM part numbers P291-0403, P291-1503 (15 MFD companion capacitor sold separately). Verify MFD rating and voltage on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — order with confidence.