{"product_id":"carrier-ha1bjx048000abaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1BJX048000ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model HA1BJX048000ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part# \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HA1BJX048000ABAA\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this part fails, the entire control circuit goes dark — your thermostat goes blank, nothing responds, and the system will not start under any condition. A blown fuse on the secondary side is often the first clue; if the replacement fuse keeps blowing, the transformer itself is the likely culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Direct plug-and-play fit for factory wiring harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM unit is wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can overload, overheat, and damage downstream controls — costing far more than the part itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label all low-voltage wires before disconnecting. Total job time is typically 20–30 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Backed by a 1-year OEM factory warranty. In-stock units ship the 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\u003eHA1BJX048000ABAA\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909360079219,"sku":"CARRIE-HA1BJX048000ABAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909360111987,"sku":"CARRIE-HA1BJX048000ABAA-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_884d1f3c-71a8-41b9-8914-bfbb6afa6374.jpg?v=1782941519","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx048000abaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}