{"product_id":"carrier-mh1ajx018010aaaa-capacitor-42krr6","title":"OEM Carrier Single Run Capacitor P291-0303 for MH1AJX018010AAAA","description":"\u003ch1\u003eOEM Carrier Single Run Capacitor P291-0303 \/ P291-0304 for Model MH1AJX018010AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM single run capacitor is the factory-specified replacement for the \u003cstrong\u003eCarrier MH1AJX018010AAAA\u003c\/strong\u003e air handler or mini-split system. A single run capacitor provides the continuous electrical charge required to keep the blower or fan motor running at correct speed and efficiency. When this capacitor degrades or fails, you'll notice symptoms such as a humming motor that won't spin up, intermittent shutdowns, sluggish blower performance, or complete motor failure — often causing the system to trip on thermal overload. Replacing this part promptly protects the motor from costly burnout damage.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Single run capacitor | Factory-matched MFD rating | 370V or 440V rated (verify on unit data plate) | Round or oval case | OEM part numbers P291-0303 and P291-0304 — confirm your unit's label before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM capacitor manufactured to exact factory MFD tolerance (±3%). Aftermarket alternatives frequently carry ±10% tolerance, placing excess stress on motor windings and reducing overall system lifespan.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the breaker and discharge the capacitor fully before handling. Tools needed: flathead and Phillips screwdrivers, 1\/4\" nut driver, needle-nose pliers, and a multimeter to verify discharge. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty \u0026amp; Shipping:\u003c\/strong\u003e Backed by a 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the \u003cstrong\u003eCarrier MH1AJX018010AAAA\u003c\/strong\u003e. This listing covers both OEM part numbers \u003cstrong\u003eP291-0303\u003c\/strong\u003e and \u003cstrong\u003eP291-0304\u003c\/strong\u003e — both are single run capacitors for this model. Always verify the MFD rating and voltage on your unit's data plate or existing capacitor before placing your order. Our parts specialists are available to confirm fitment before you buy — don't guess on a safety-critical electrical component.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909285695859,"sku":"CARRIE-MH1AJX018010AAAA-CAPACITOR-P291-0303","price":17.0,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909285728627,"sku":"CARRIE-MH1AJX018010AAAA-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_1511c835-a2e9-4d39-bdd0-8d2b5b24fc25.jpg?v=1782936765","url":"https:\/\/nationalhvacparts.com\/products\/carrier-mh1ajx018010aaaa-capacitor-42krr6","provider":"National HVAC Parts","version":"1.0","type":"link"}