{"product_id":"carrier-ma1ajx018000aaaa-capacitor-42krr6","title":"OEM Carrier Single Run Capacitor P291-0303 for MA1AJX018000AAAA","description":"\u003ch1\u003eOEM Carrier Single Run Capacitor for Model MA1AJX018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM single run capacitor is the factory-specified replacement for the \u003cstrong\u003eCarrier MA1AJX018000AAAA\u003c\/strong\u003e air handler or fan coil unit. A run capacitor maintains a continuous phase-shifted current to keep the blower or fan motor running efficiently at full speed. When the capacitor weakens or fails, you may notice the motor humming without starting, sluggish fan performance, increased amp draw, frequent tripping of the circuit breaker, or the unit shutting down on thermal overload. Replacing this component with the correct OEM part restores factory-rated motor performance and protects against premature motor failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Single run capacitor | Factory-rated MFD and voltage — verify your unit's data plate for exact MFD rating | Round or oval case (per factory spec) | Tight ±3% capacitance tolerance for precise motor support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM capacitors (P291-0303 \/ P291-0304) are manufactured to Carrier's exact electrical specifications. Generic alternatives often carry a wider ±10% MFD tolerance, which can cause motor overheating, reduced efficiency, and shortened component lifespan over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always discharge the capacitor fully before removing any wiring. Tools needed: 1\/4\" nut driver, insulated needle-nose pliers, and a multimeter capable of capacitance testing. Photograph all wiring connections before disconnecting terminals to ensure correct reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Backed by a 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the \u003cstrong\u003eCarrier MA1AJX018000AAAA\u003c\/strong\u003e air handler unit. OEM part numbers \u003cstrong\u003eP291-0303\u003c\/strong\u003e and \u003cstrong\u003eP291-0304\u003c\/strong\u003e are both applicable single run capacitor variants for this model — confirm the MFD and voltage rating on your existing capacitor or equipment data plate before ordering. Our parts specialists are available to verify exact fitment prior to purchase. Order today and receive same-day shipping on in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909286318451,"sku":"CARRIE-MA1AJX018000AAAA-CAPACITOR-P291-0303","price":17.0,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909286351219,"sku":"CARRIE-MA1AJX018000AAAA-CAPACITOR-P291-0303-GEN","price":13.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-capacitor-round-single-P291-0303_caf64b9a-d1bb-44c9-9226-482bc37346c6.jpg?v=1782936760","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ma1ajx018000aaaa-capacitor-42krr6","provider":"National HVAC Parts","version":"1.0","type":"link"}