OEM Carrier Dual Run Capacitor 40+5 MFD 370V for Model PH1PNB030000AAAA

This is the factory-specified OEM dual run capacitor (part number P291-4053) for the Carrier PH1PNB030000AAAA condensing unit. The dual run capacitor stores and releases the precise electrical charge needed to start and sustain both the compressor and condenser fan motor simultaneously. When this capacitor weakens or fails, you'll typically notice the system humming without starting, the outdoor unit short-cycling within minutes of startup, or the condenser fan spinning sluggishly or not at all. Left unchecked, a failed capacitor rapidly accelerates compressor wear and can lead to costly burnout.

Also included in this listing: the P291-1503 Single Run Capacitor, the OEM-spec standalone capacitor for blower or fan motor circuits on compatible Carrier systems. Both parts are genuine Carrier Totaline components engineered to exact factory tolerances.

• Specs (P291-4053 Dual Run): 40+5 MFD (microfarad) | 370V rated | Oval case | 50/60 Hz | AFC 10,000 | ±6% tolerance | Castor oil protected | Dimensions: 3 5/8" H × 3 1/2" L × 1 7/8" W
• OEM vs Generic: Genuine Carrier OEM capacitors are manufactured to exact ±6% MFD tolerance. Generic aftermarket units commonly run ±10% or worse, placing added stress on compressor windings and shortening motor life — ultimately costing more in downstream repairs.
• Install Difficulty: 2/5 — Always discharge the capacitor fully before touching any terminals (use a 20kΩ resistor or insulated screwdriver). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance mode). Photograph all wiring connections before disconnecting. Swap terminals one-at-a-time to avoid miswiring HERM, FAN, and COMMON leads.
• Warranty & Shipping: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse. Fast, tracked delivery nationwide.

Compatibility: Engineered for the Carrier PH1PNB030000AAAA condensing unit. OEM part numbers covered: P291-4053 (Dual Run Capacitor) and P291-1503 (Single Run Capacitor). Note: P291-4053 has been superseded by P291-4054RS — both are stocked. Verify MFD rating, voltage, and terminal configuration on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy.