{"product_id":"carrier-ha1ajx042000aaaa-contactor-1iwxlq","title":"OEM Carrier Contactor 24V Coil 2-Pole for HA1AJX042000AAAA","description":"\u003ch1\u003eOEM Carrier 2-Pole Contactor HN51KC024 for Model HA1AJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement contactor for the \u003cstrong\u003eCarrier HA1AJX042000AAAA\u003c\/strong\u003e split-system air conditioner. The contactor is a high-voltage relay that receives a 24V signal from your thermostat and closes to send 240V line power to the compressor and condenser fan motor. When the contactor fails — due to pitted or burned contacts, a stuck plunger, or a failed coil — your outdoor unit will not energize even when the thermostat is calling for cooling. Common symptoms include a buzzing outdoor unit with no compressor startup, or an outdoor unit that simply does nothing when the thermostat is set below room temperature.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part Number HN51KC024 | 2-Pole design | 24V control coil | Factory-rated amperage for \u003cstrong\u003eHA1AJX042000AAAA\u003c\/strong\u003e condenser | Direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM contactor is manufactured to Carrier's exact coil pull-in voltage and contact rating specifications. Generic contactors may use lower-grade silver alloy contacts that pit faster under load, reducing service life and risking compressor damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box before servicing. Tools needed: flathead and Phillips screwdrivers, 1\/4\" and 5\/16\" nut drivers, needle-nose pliers, multimeter. Photograph all wire connections before removing the old contactor. Wires transfer one-at-a-time to avoid miswiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eHA1AJX042000AAAA\u003c\/strong\u003e condensing unit. Cross-references OEM part number HN51KC024. Verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909369155955,"sku":"CARRIE-HA1AJX042000AAAA-CONTACTOR-HN51KC024","price":31.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909369188723,"sku":"CARRIE-HA1AJX042000AAAA-CONTACTOR-HN51KC024-GEN","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-contactor-2pole-HN51KC024_a1417726-ec66-43d4-b298-361fe66d83d9.jpg?v=1782905284","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1ajx042000aaaa-contactor-1iwxlq","provider":"National HVAC Parts","version":"1.0","type":"link"}