OEM Carrier Dual Run Capacitor 45+5 MFD 370V for Model PY2PNB030040NB

This is the OEM factory-specified dual run capacitor for the Carrier PY2PNB030040NB split-system air conditioner and heat pump condenser. The dual run capacitor stores and releases the electrical charge required to start and sustain both the compressor and the condenser fan motor during every cooling cycle. When this capacitor degrades or fails, you'll typically hear a low hum with no compressor or fan motor starting, experience intermittent short-cycling, or notice the outdoor unit attempting to start but immediately tripping off. Left unaddressed, a weak capacitor accelerates wear on both the compressor and fan motor windings — often turning a low-cost part swap into a far more expensive repair.

• Specs: 45+5 MFD (microfarad) | 370 VAC rated | Oval case | 50/60 Hz | ±5% factory tolerance | OEM Part Numbers: P291-4553 (superseded by P291-4554), with associated single run capacitors P291-0403 and P291-1503
• OEM vs Generic: This is a genuine Carrier/Totaline OEM capacitor — not an aftermarket substitute. Generic capacitors frequently run ±10% MFD tolerance, which increases electrical stress on compressor and motor windings and shortens component life. OEM units are built to the exact factory specification for the PY2PNB030040NB platform.
• Install Difficulty: 2/5 — Capacitors store a lethal charge even after power is disconnected. Always discharge the capacitor with an insulated resistor tool before touching any terminals. Tools needed: 1/4" nut driver, needle-nose pliers, insulated discharge tool, multimeter. Photograph all wiring connections before removing the old unit.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty. In stock and ships same business day from our warehouse — order by 3 PM local time for guaranteed same-day dispatch.

Compatibility: Designed for the Carrier PY2PNB030040NB condenser. Cross-references OEM part numbers P291-4553, P291-4554 (current successor SKU), P291-0403, and P291-1503. Always verify the MFD rating and voltage printed on your existing capacitor's label against this listing before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — reach out via chat or phone.