{"product_id":"carrier-ha1bjx018000adaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1BJX018000ADAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HA1BJX018000ADAA\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 HA1BJX018000ADAA\u003c\/strong\u003e. The transformer steps down 120V line voltage to the 24V AC signal required to power the thermostat, control board, and all low-voltage switching components. When the transformer fails, the entire control circuit goes dead — your thermostat will show a blank screen, the system will not respond to any inputs, and no heating or cooling will occur. A failed transformer is often caused by a shorted control wire, a bad contactor coil, or accumulated overload trips.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Factory OEM tolerance matched for Carrier control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01AW229 transformer is wound and rated to exact Carrier specifications. Generic transformers may carry incorrect VA ratings that cause overheating, nuisance tripping, or premature failure of downstream control boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or terminal connectors, and a multimeter to verify 24V output after installation. Always photograph existing wiring before disconnecting leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the Carrier \u003cstrong\u003eHA1BJX018000ADAA\u003c\/strong\u003e. Always verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. If you are unsure of fitment, our parts specialists are available to confirm compatibility before you purchase.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909366829427,"sku":"CARRIE-HA1BJX018000ADAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909366862195,"sku":"CARRIE-HA1BJX018000ADAA-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_4e3fb1de-0037-4740-af24-6808b6ff3a13.jpg?v=1782941493","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx018000adaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}