OEM Carrier Dual Run Capacitor 45+5 MFD for Model PH4ZNA042000AA

This is the factory OEM dual run capacitor (part number P291-4554RS) for the Carrier PH4ZNA042000AA heat pump system. The dual run capacitor serves a critical role in your unit's electrical system — it stores and releases the precise electrical charge needed to start and continuously run both the compressor and the condenser fan motor. When this capacitor degrades or fails, you'll typically notice symptoms such as a loud humming or buzzing with no motor movement, the system attempting to start but quickly shutting down, the condenser fan spinning slowly or not at all, or the compressor failing to engage entirely.

• Specs: 45+5 MFD (microfarad) | Round case design | Factory-matched capacitance tolerance | Rated for use in Carrier PH4ZNA042000AA heat pump applications
• OEM vs Generic: As an OEM part, the P291-4554RS meets Carrier's exact factory tolerances (typically ±3% MFD), ensuring proper motor start torque and run performance. Generic or aftermarket capacitors often carry a ±10% tolerance, which can accelerate wear on the compressor and fan motor bearings over time.
• Install Difficulty: 2/5 — A dual run capacitor replacement is one of the more accessible HVAC repairs for a qualified technician. Always discharge the capacitor fully before handling terminals. Tools needed: 1/4" nut driver, insulated needle-nose pliers, and a multimeter to verify discharge. Photograph all wiring connections before disconnecting anything.
• Warranty: Backed by a 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: This part is engineered specifically for the Carrier PH4ZNA042000AA heat pump. Always cross-reference the MFD rating and voltage specification on your unit's data plate before ordering to confirm fitment. Not sure? Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required. Order today and get same-day shipping on all in-stock parts.