OEM Carrier Dual Run Capacitor 40+5 MFD 440V for Model PH4GNXB30000AA

This OEM dual run capacitor (part number P291-4054RS) is the factory-specified replacement for the Carrier PH4GNXB30000AA air conditioning system. The dual run capacitor serves a critical role: it simultaneously stores and delivers the electrical charge required to start and sustain both the compressor and the condenser fan motor. When this component degrades or fails, you'll commonly experience symptoms such as a loud humming noise with no motor movement, a compressor that trips off within minutes of starting, a condenser fan that refuses to spin, or a unit that blows warm air. Replacing it promptly prevents costly secondary damage to the compressor.

• Specs: 40+5 MFD (microfarad) | 370/440V dual-rated | Round case | 50/60 Hz | Factory-matched ±3% tolerance | OEM part number P291-4054RS
• OEM vs Generic: This is the genuine OEM-specification capacitor engineered to Carrier's exact electrical tolerances. Generic aftermarket capacitors commonly carry a ±10% MFD variance, which accelerates motor winding wear and can significantly shorten compressor service life — a risk not worth taking on a component this critical.
• Install Difficulty: 2/5 — A straightforward swap for any handy homeowner or technician. Always shut off power at the disconnect and use a resistor or insulated screwdriver to discharge the capacitor before touching terminals. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (to verify discharge and confirm MFD). Always photograph all terminal wiring connections before removing the old capacitor.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse — get your system back online fast.

Compatibility: Engineered as the direct OEM replacement for Carrier model PH4GNXB30000AA. Always verify the MFD rating and voltage printed on your existing capacitor's label or the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.