OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY1PPB030040AAAA (P291-0403 / P291-1503)

This is the factory-specified OEM single run capacitor for the Carrier PY1PPB030040AAAA packaged unit. This unit uses two individual single run capacitors — P291-0403 (4 MFD 370V) for the condenser fan motor and P291-1503 (15 MFD 370V) for the compressor — rather than a combined dual run unit. A run capacitor maintains the continuous phase shift required to keep the motor spinning efficiently. When it degrades or fails, you'll notice symptoms such as a humming motor that won't start, the compressor or fan cycling off shortly after startup, higher-than-normal energy draw, or a complete no-start condition on the affected motor circuit.

• Specs (P291-0403): 4 MFD (microfarad) | 370 VAC rated | Oval case | ±5% factory tolerance | Replaces OEM P/N HC90AA004, HC91CA004, HC90AB004
• Specs (P291-1503): 15 MFD (microfarad) | 370 VAC rated | Oval case | ±5% factory tolerance | RoHS Compliant | UL Approved with Pressure Sensitive interrupter
• OEM vs Generic: These are genuine Carrier Totaline-series capacitors, reliability-tested to 60,000 service hours with high-grade metallized polypropylene film and 100% electrical testing at the factory. Generic alternatives frequently run outside ±5% MFD tolerance, accelerating motor wear and risking compressor damage over time.
• Install difficulty: 2/5 — Always discharge the capacitor before handling any terminals. Tools needed: 1/4" nut driver, needle-nose pliers, multimeter (capacitance mode). Photograph all wiring before disconnecting. Match MFD and voltage ratings exactly to your unit's data plate.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY1PPB030040AAAA packaged unit. Verify both the MFD rating and voltage (370V) on your unit's data plate before ordering. Note: P291-0403 has been superseded by P291-0404, and P291-1503 has been superseded by P291-1504 — our stock reflects the current OEM-equivalent specification. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — order now and ship today.