OEM Carrier Single Run Capacitor P291-4004 for Model YAC42110YACX102AK

This OEM single run capacitor (part number P291-4004) is the factory-specified replacement for the Carrier YAC42110YACX102AK air conditioning unit. The run capacitor provides the continuous phase-shifted electrical charge needed to keep the compressor or condenser fan motor running efficiently at full speed. When this capacitor degrades or fails, you may notice the system humming without the motor starting, the compressor or fan struggling to spin up, increased energy consumption, or the unit short-cycling and tripping on thermal overload protection.

• Specs: Single run capacitor | OEM part number P291-4004 | Factory-matched MFD and voltage ratings | Round or oval case per OEM specification | ±3% factory tolerance for precise motor protection
• OEM vs Generic: This is a genuine OEM Carrier capacitor built to exact factory specifications. Generic aftermarket units often carry ±6–10% MFD tolerance, which accelerates motor winding wear, shortens compressor life, and can void equipment warranties.
• Install Difficulty: 2/5 — A straightforward replacement suitable for qualified technicians or experienced DIYers. Always discharge the capacitor fully before handling. Tools needed: 1/4" nut driver, needle-nose pliers, insulated screwdriver, and a multimeter to verify discharge. Photograph all wiring connections before removal.
• Warranty: Backed by a 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier YAC42110YACX102AK air conditioning system. Always cross-reference the MFD rating and voltage printed on your existing capacitor's label or the unit's data plate before ordering to confirm an exact match. Not sure it fits? Our HVAC parts specialists verify fitment before you place your order — contact us anytime.