OEM Carrier Dual Run Capacitor 40+5 MFD 370V for Model PY1PNB036090NBAA

This OEM dual run capacitor (Carrier part number P291-4053) is the factory-specified replacement for the Carrier PY1PNB036090NBAA split-system air conditioner. The dual run capacitor stores and releases the electrical charge required to start and sustain both the compressor and the condenser fan motor simultaneously. A failing capacitor is one of the most common causes of AC failure in the field — symptoms include a distinct hum with no motor movement, the compressor short-cycling within minutes of startup, or the outdoor unit failing to start while the air handler continues to run. This unit also uses supporting single run capacitors P291-0403 (4 MFD 370V) and P291-1503 (15 MFD 370V) — confirm your unit's data plate before ordering all three.

• Specs: 40+5 MFD (microfarad) | 370 VAC rated | Oval case style | Factory-matched ±3% tolerance | Non-PCB dielectric fluid | UL-approved pressure-sensitive current interrupter
• OEM vs Generic: This is a genuine Carrier OEM capacitor sourced from Carrier's approved manufacturer (Totaline/Genteq lineage). OEM units maintain exact ±3% MFD tolerance; generic aftermarket capacitors commonly run ±10%, which accelerates compressor and fan motor wear and can void equipment warranties.
• Install difficulty: 2/5 — Always discharge the capacitor fully before touching any terminals (use an insulated resistor or discharge tool). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter with capacitance mode. Photograph all wiring connections before disconnecting. Observe polarity markings on the HERM, FAN, and COM terminals.
• Warranty & Shipping: 1-year OEM factory warranty against defects. Ships same business day from our warehouse. Fast delivery to keep your system — and your customers — cool.

Compatibility: Designed for the Carrier PY1PNB036090NBAA split-system air conditioner. Also cross-references OEM part numbers P291-4053, P291-0403, and P291-1503 for this platform. Always verify MFD rating and voltage on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork.