OEM Carrier Dual Run Capacitor 45+5 MFD 370V for Model PY2PNB030040AA

This OEM dual run capacitor (P291-4553 / superseded by P291-4554) is the factory-specified replacement for the Carrier PY2PNB030040AA split-system air conditioner. The dual run capacitor serves a critical function: it stores and delivers the electrical charge needed to start and sustain both the compressor and condenser fan motor simultaneously. When this capacitor degrades or fails, you'll commonly hear the unit attempt to start with a loud hum but no motor spin, experience short-cycling, notice the condenser fan running while the compressor does not (or vice versa), or find the system tripping on thermal overload. Replacing this part promptly protects the compressor — the most expensive component in your system.

• Specifications: 45+5 MFD (microfarad) | 370V rated | Oval case form factor | Factory-matched ±3% tolerance | UL approved current interrupter | Non-PCB dielectric fluid
• OEM vs Generic: OEM capacitors from Carrier are manufactured to exact factory tolerances. Generic aftermarket units frequently run ±10% MFD deviation, which accelerates motor winding stress, shortens compressor life, and can void equipment warranties.
• Install Difficulty: 2/5 — Always discharge the capacitor fully before handling any terminals. Tools needed: 1/4" nut driver or 5/16" socket, needle-nose pliers, multimeter (capacitance setting). Photograph all wiring connections before disconnecting. This is a DIY-accessible repair for homeowners comfortable with basic electrical safety.
• Warranty & Shipping: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse. Orders placed before 3pm local time qualify for same-day dispatch.

Compatibility Note: Engineered specifically for Carrier model PY2PNB030040AA. OEM part numbers covered: P291-4553 (primary), P291-0403 (single run), P291-1503 (single run). Always verify MFD rating and voltage against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.