OEM Carrier Single Run Capacitor P291-1503 for Model FB4ASX070000AEAA

This is the factory-specified OEM single run capacitor (part number P291-1503) for the Carrier FB4ASX070000AEAA air handler. Unlike a dual run capacitor, a single run capacitor is dedicated solely to the blower motor — storing and releasing the electrical charge needed to start and sustain continuous motor operation. When this capacitor fails, the blower motor will often hum without spinning, start sluggishly, overheat, or cause the unit to shut down on thermal overload protection shortly after startup. Replacing this component promptly protects the blower motor from permanent winding damage.

• Specs: Single run capacitor | OEM part number P291-1503 | Factory-matched MFD and voltage rating | Round or oval case (verify against data plate) | ±5% tolerance to factory specification
• OEM vs Generic: This OEM capacitor is wound and tested to Carrier's exact factory tolerances. Generic aftermarket capacitors often carry a ±10% MFD variance, which causes increased motor heat, reduced efficiency, and shortened blower motor life — ultimately costing more in the long run.
• Install Difficulty: 2/5 — Always discharge the capacitor fully before handling terminals. Tools needed: 1/4" nut driver, insulated needle-nose pliers, multimeter (capacitance setting). Photograph all wiring connections before disconnecting leads. Lock out and tag out power at the breaker prior to any work.
• Warranty & Shipping: Backed by a 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed and tested for the Carrier FB4ASX070000AEAA air handler. Always confirm the MFD rating and voltage printed on your existing capacitor's label or the unit's data plate before ordering to ensure a correct fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you order — reach out via chat or phone.