OEM Carrier Single Run Capacitor P291-1003 for Model PF4MNA030000AAAA

This OEM single run capacitor (part number P291-1003) is the factory-specified replacement for the Carrier PF4MNA030000AAAA fan coil/air handler unit. The run capacitor provides a continuous phase-shifted current to keep the blower or condenser fan motor running smoothly at full efficiency. When a single run capacitor fails, the motor it serves loses torque, draws excess amperage, and will typically hum without starting — or overheat and trip its thermal overload. Left unaddressed, a failed capacitor will shorten motor life significantly.

• Part Specs: OEM single run capacitor | Factory-matched MFD rating and voltage | Round or oval case per factory spec | Rated tolerance within ±3% for precise motor protection — verify your unit's data plate for exact MFD and voltage before ordering
• OEM vs. Generic: This is a genuine Carrier OEM component manufactured to exact factory tolerances. Generic capacitors often deviate ±10% MFD from spec, increasing motor operating temperature and accelerating winding failure — a false economy that risks a far more expensive motor replacement.
• Install Difficulty: 2/5 — A straightforward swap, but safety is critical. Always disconnect power at the breaker before opening the unit. Discharge the capacitor fully using an insulated resistor before touching terminals. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, and a multimeter to verify the old capacitor has failed. Photograph all wiring connections before removal.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse so your system is back up fast.

Compatibility: Engineered as a direct OEM replacement for the Carrier PF4MNA030000AAAA. Always cross-reference the MFD rating and voltage printed on your existing capacitor or the unit data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — just reach out before placing your order.