OEM Carrier Dual Run Capacitor 40+5 MFD 370V for Model PH1ZNA036000AAAA

This OEM dual run capacitor (Carrier part# P291-4053RS, with companion single run capacitor P291-1503) is the factory-specified replacement for the Carrier PH1ZNA036000AAAA package heat pump unit. The dual run capacitor stores and delivers the electrical charge required to start and sustain both the compressor and the condenser fan motor simultaneously from a single enclosure. When this capacitor begins to fail, you'll typically notice the system humming but not starting, short-cycling within the first few minutes of operation, or warm air blowing from a unit that should be cooling. Left unaddressed, a weak capacitor accelerates compressor wear and can lead to a far more expensive repair.

• Specs: 40+5 MFD (microfarad) | 370 VAC rated | Round case | Three-terminal (HERM / FAN / COM) | Factory-matched ±5% tolerance | 50/60 Hz | Non-PCB dielectric fluid | UL approved
• OEM vs Generic: OEM Carrier capacitors (manufactured by GE/Genteq for Carrier) are performance-tested to 60,000 service hours and built to exact factory tolerance. Generic aftermarket capacitors often carry a ±10% MFD tolerance, which accelerates motor winding stress and can shorten compressor life — a risk not worth taking on a 3-ton package unit.
• Install difficulty: 2/5 — Always discharge the capacitor fully before handling any terminals (use a 20kΩ resistor or insulated screwdriver). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance setting). Photograph all wiring connections before disconnecting. This job typically takes 15–30 minutes for a competent DIYer.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse. Bundle with companion single run capacitor P291-1503 (15 MFD 370V oval) to complete a full capacitor service on your PH1ZNA036000AAAA.

Compatibility: Engineered for the Carrier PH1ZNA036000AAAA 3-ton package heat pump. Verify the MFD rating and voltage on your unit's data plate before ordering — the compressor side must match 40 MFD and the fan side must match 5 MFD. Voltage rating of 370V or higher is acceptable. Not sure it fits? Our HVAC parts team verifies fitment before you order — reach out before checkout.