OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY1REA048115AAWA

This is the factory-specified OEM single run capacitor for the Carrier PY1REA048115AAWA packaged unit. The run capacitor remains in the electrical circuit the entire time the fan motor or compressor is operating, providing the phase-shifted current needed to keep the motor running efficiently. When this capacitor weakens or fails, you'll typically notice symptoms such as a humming sound with no motor startup, warm air blowing from the system, or the unit short-cycling and shutting off shortly after starting. Replacing it promptly prevents cascading damage to the motor windings.

• Specs: 4 MFD (microfarad) | 370 VAC rated | Oval case form factor | ±5% factory tolerance | 50/60 Hz | RoHS compliant
• OEM vs Generic: This is a genuine Carrier/Totaline OEM part (P291-0403) manufactured to exact factory tolerances. Generic capacitors often carry a ±10% MFD tolerance, which can accelerate motor wear and shorten equipment life — especially critical in a packaged unit where motor replacement is labor-intensive.
• Install difficulty: 2/5 — Disconnect power and allow the capacitor to fully discharge before handling. Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter (to verify discharge). Always photograph or label wire positions before removal. The oval case mounts in the existing bracket with no modification required.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY1REA048115AAWA. Also cross-references secondary OEM part number P291-1503 (15 MFD 370V single run capacitor) — verify the MFD and voltage ratings on your unit's data plate before ordering to confirm which capacitor position you are replacing. Questions about fitment? Our HVAC parts team verifies compatibility before you order — contact us today. In stock — ships today.