{"product_id":"carrier-ha1cjx018000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1CJX018000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model HA1CJX018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier HA1CJX018000AAAA\u003c\/strong\u003e. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead — the thermostat goes blank, nothing responds, and the system will not attempt to heat or cool. It is often the first part to check when a unit shows absolutely no signs of life despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01AW229 | Factory-matched output tolerance for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier transformer built to exact VA and voltage tolerances. Generic substitutes frequently run under-rated VA, causing overheating and premature failure — especially on systems with multiple 24V accessories such as zone boards or humidifiers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before removal. Secure all wire nuts firmly on reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eHA1CJX018000AAAA\u003c\/strong\u003e. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's wiring diagram before ordering. If you are unsure of fitment, our technical team is available to confirm compatibility before your purchase. Order today and get same-day shipping on in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909358932339,"sku":"CARRIE-HA1CJX018000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909358965107,"sku":"CARRIE-HA1CJX018000AAAA-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_f693b317-fbf5-451e-9f07-f1349d6cd8e8.jpg?v=1782941527","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1cjx018000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}