OEM Carrier Dual Run Capacitor 40+5 MFD 440V for Model PH1PNB042000AAAA

This OEM dual run capacitor (part number P291-4054) is the factory-specified replacement for the Carrier PH1PNB042000AAAA heat pump condenser. The dual run capacitor serves a critical role: it stores and delivers the electrical charge needed to start and sustain both the compressor and the condenser fan motor simultaneously. When this capacitor degrades or fails, you'll typically notice a loud hum with no motor movement, a system that trips off within seconds of starting, or a condenser fan that spins only when manually nudged. A secondary single run capacitor (part number P291-1503) is also used on this model for dedicated fan motor support — verify your unit's wiring diagram to confirm which capacitor requires replacement before ordering.

• Specs: 40+5 MFD (microfarad) | 370–440V rated | Round case | 50/60 Hz | Factory-matched tolerance | OEM Part # P291-4054 (also referenced as P291-4054RS)
• OEM vs Generic: OEM capacitors are built to exact factory MFD tolerance specifications. Generic alternatives commonly run at ±10% MFD deviation, which accelerates compressor wear and shortens fan motor life over time. This is a genuine Carrier-sourced capacitor — note that the capacitor body may display the name of the component manufacturer rather than Carrier, which is standard practice.
• Install difficulty: 2/5 — Always disconnect power at the breaker and wait at least 5 minutes before touching any terminals to allow residual charge to dissipate. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance function). Photograph all wiring connections before disconnecting. Terminals are labeled C (common), HERM (compressor), and FAN — reinstall wires to their exact original terminals.
• Warranty: 1-year OEM manufacturer warranty from date of purchase. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for Carrier model PH1PNB042000AAAA heat pump condensers. This listing covers the primary dual run capacitor (P291-4054). A companion single run capacitor (P291-1503) is also available for this model — see our catalog or contact our team for fitment verification. Always confirm MFD rating and voltage on your unit's data plate before ordering. Questions? Our HVAC parts specialists verify fitment before you buy.