OEM Carrier Dual Run Capacitor 55+5 MFD 370V for Model PH4RNG042000BBAA

This is the factory-specified OEM dual run capacitor (part number P291-5553RS) for the Carrier PH4RNG042000BBAA packaged heat pump unit. The dual run capacitor stores and releases the electrical charge required to start and sustain both the compressor and the condenser fan motor simultaneously. When this capacitor degrades or fails, you'll notice classic symptoms: a low humming sound with no motor movement, the system short-cycling within the first few minutes of operation, or the unit tripping the breaker under starting load. Left unaddressed, a weak capacitor places severe strain on the compressor — potentially leading to a far more costly repair. This unit also uses a companion start capacitor P281-8806 (88–108 MFD, 330V) to assist the compressor during startup; both capacitors should be inspected together and replaced as a set whenever either one shows signs of failure.

• Specs — Dual Run Capacitor (P291-5553RS): 55+5 MFD (microfarad) | 370V rated (440V-rated replacement P291-5554RS also fits) | Round case | ±5% factory tolerance | AFC 10,000 protected, no-PCB design
• Specs — Start Capacitor (P281-8806): 88–108 MFD | 330V | With bleed resistor | 2.06″ diameter × 4.37″ height — verify both parts on your unit's data plate before ordering
• OEM vs Generic: OEM capacitors are manufactured to Carrier's exact tolerance specifications. Aftermarket units commonly run ±10% MFD deviation, which accelerates motor winding stress and shortens compressor life — especially critical in a packaged unit where service access is limited.
• Install Difficulty: 2/5 — Always discharge capacitors fully before handling (a charged capacitor can retain lethal voltage). Tools needed: 1/4″ nut driver, insulated needle-nose pliers, multimeter (capacitance mode). Photograph all wiring before disconnecting terminals. 1-year OEM warranty included. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PH4RNG042000BBAA packaged heat pump unit. Note that P291-5553RS (370V) has been superseded by P291-5554RS (370/440V dual-rated), which is the current OEM-equivalent shipment. Confirm MFD rating and voltage on your unit's data plate before installing. Questions about fitment? Our HVAC parts team verifies compatibility before every order — reach out and we'll confirm the right part ships to you today.