{"product_id":"carrier-ha1bjx042000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HA1BJX042000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01AW229 for Model HA1BJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier HA1BJX042000AAAA\u003c\/strong\u003e air handler. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, control board, and all relay coils. When this transformer fails, the entire control circuit goes dark: the thermostat loses power, the system stops responding to calls for heating or cooling, and nothing works. It is often the first component to inspect when the system appears completely dead despite having line power present.\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 HT01AW229 transformer is wound and rated to Carrier's exact VA and voltage specifications. Generic units may under-deliver VA under load, causing intermittent control lockouts, blown fuses on the control board, or premature failure of downstream components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 24V output after install), wire nuts or quick-connect terminals. Photograph all low-voltage wiring before disconnecting. The transformer mounts to the cabinet with one or two screws and connects to both the line-voltage harness and the 24V control wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eHA1BJX042000AAAA\u003c\/strong\u003e air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you are unsure of fitment, our HVAC parts specialists can confirm compatibility before you purchase — same-day shipping available on all stocked OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909360996723,"sku":"CARRIE-HA1BJX042000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909361029491,"sku":"CARRIE-HA1BJX042000AAAA-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_10dd8bbb-8625-4821-9466-d97d303f008f.jpg?v=1782939888","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}