OEM Carrier Dual Run Capacitor 35+5 MFD 440V for Model PH4ZNA030000AA

This OEM dual run capacitor (part# P291-3554RS) is the factory-specified replacement for the Carrier PH4ZNA030000AA heat pump condenser. The dual run capacitor serves double duty — it stores and delivers the electrical charge needed to start and sustain both the compressor and the outdoor condenser fan motor simultaneously. When it degrades or fails, common symptoms include a loud humming with no motor movement, the compressor short-cycling, the fan spinning slowly or not at all, or the unit tripping the breaker under load. A failed capacitor is one of the most common and easily overlooked causes of a no-cool call in the field.

• Specs: 35+5 MFD (microfarad) | 440V rated | Round case | ±6% tolerance | 50/60 Hz | 10,000 AFC | Castor oil protected | No PCBs | UL recognized
• OEM vs Generic: This is the genuine Carrier OEM part (P291-3554RS), built to exact factory tolerances. Generic capacitors often carry a ±10% MFD tolerance, which can accelerate compressor wear and reduce motor life over repeated start cycles.
• Install difficulty: 2/5 — Always discharge the capacitor fully before touching terminals. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. The round case mounts in a standard capacitor bracket — no modification required.
• Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse — get your system back online fast.

Compatibility: Engineered to fit the Carrier PH4ZNA030000AA heat pump condenser. Always verify the MFD rating and voltage against your unit's data plate before ordering. Note: Carrier sources capacitors from third-party manufacturers — the label on the capacitor may reflect the component maker rather than Carrier. Have a fitment question? Our HVAC parts team verifies compatibility before you order — reach out before you buy.