{"product_id":"carrier-ha1bjx030000acaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1BJX030000ACAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HA1BJX030000ACAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HA1BJX030000ACAA\u003c\/strong\u003e. The control transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system won't respond to any commands, and no diagnostic codes will display. It is often the first part to suspect when nothing works and fuses or breakers are intact.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01AW229 | Factory-matched to Carrier specifications\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 factory tolerances. Generic substitutes may underperform under sustained load, leading to brownouts on the 24V circuit that cause erratic system behavior or premature control board failure.\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 stripper, multimeter. Label all low-voltage wires before disconnecting. Confirm 24V output with a multimeter after installation before restoring full system power.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for the \u003cstrong\u003eCarrier HA1BJX030000ACAA\u003c\/strong\u003e. Always verify primary and secondary voltage ratings on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us and reference model \u003cstrong\u003eHA1BJX030000ACAA\u003c\/strong\u003e and part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909363847539,"sku":"CARRIE-HA1BJX030000ACAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909363880307,"sku":"CARRIE-HA1BJX030000ACAA-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_1a427259-043a-49df-bd60-477a64d524fb.jpg?v=1782941503","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx030000acaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}