{"product_id":"carrier-ha1ajx042000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1AJX042000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model HA1AJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eHA1AJX042000AAAA\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, and all low-voltage components. When this part fails, the entire control circuit goes dead — your thermostat goes blank, the system refuses to respond to any calls for heating or cooling, and no components energize. It is often the first part to inspect when nothing in the system works at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01AW229 | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM transformer is wound and insulated to Carrier's exact specifications, ensuring stable 24V output under full control-circuit load. Off-brand units often underperform at rated VA, causing nuisance lockouts and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Always confirm primary voltage at the unit before replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships 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 unit using OEM part number HT01AW229. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909369418099,"sku":"CARRIE-HA1AJX042000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909369450867,"sku":"CARRIE-HA1AJX042000AAAA-TRANSFORMER-HT01AW229-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01AW229_a224bcb2-24cd-4f8f-884f-0b763ef30160.jpg?v=1782941488","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1ajx042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}