OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY1REA036074ABWB

This OEM Carrier single run capacitor (part numbers P291-0403 and P291-1503) is the factory-specified replacement for the Carrier PY1REA036074ABWB packaged unit. A single run capacitor maintains a continuous phase-shifted current to keep the fan motor or compressor running smoothly after startup. When it degrades or fails, you'll typically notice the motor struggling to start, humming without turning, overheating, or the unit shutting down on a high-current fault shortly after energizing.

• Specs: P291-0403: 4 MFD (microfarad) | 370V rated | Oval case | CBB65-V rated | RoHS compliant — P291-1503: 15 MFD | 370V rated | Oval case | CBB65-V rated | Both are Totaline/Carrier factory-spec components tested to 60,000 service hours
• OEM vs Generic: These Totaline OEM capacitors are subjected to 100% electrical testing at the factory, including capacitance verification and high-potential withstand testing. Generic capacitors frequently run ±10% MFD tolerance, which accelerates motor winding wear and shortens compressor life over time.
• Install difficulty: 2/5 — Always discharge the capacitor before handling. Tools needed: 1/4" nut driver, insulated needle-nose pliers, multimeter with capacitance function. Photograph all wiring connections before disconnecting. Match VAC voltage and MFD rating to your unit's data plate before installing.
• Warranty: 1-year OEM factory warranty. Orders ship same business day from our warehouse.

Compatibility: Fits Carrier model PY1REA036074ABWB. Note: P291-0403 has been superseded by P291-0404 and P291-1503 has been superseded by P291-1504 — all are functionally equivalent direct replacements. Verify MFD and voltage ratings on your unit's data plate before ordering. Our team is available to confirm fitment prior to purchase.