{"product_id":"carrier-ha1ajx018000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120\/24V for HA1AJX018000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model HA1AJX018000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HA1AJX018000AAAA\u003c\/strong\u003e air handler unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the result is typically a completely unresponsive system: a blank thermostat display, no contactor pull-in, and no heating or cooling operation. If your system is completely dead with 120V confirmed at the unit but no 24V at the secondary terminals, this transformer is the most likely culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01AW229 | Factory-matched for Carrier HA1AJX018000AAAA air handler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and voltage specifications. Generic replacements often run under-rated VA loads, causing overheating and premature failure — especially when multiple accessories share the 24V circuit.\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, wire nuts or spade connectors. Verify 0V at primary terminals before handling. Photograph all wiring connections prior to removal.\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 stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eHA1AJX018000AAAA\u003c\/strong\u003e air handler. Verify your unit's control circuit voltage and VA requirements on the data plate before ordering. If you are unsure of fitment, our parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909371646323,"sku":"CARRIE-HA1AJX018000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909371679091,"sku":"CARRIE-HA1AJX018000AAAA-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_cd515e58-73a4-46c9-89a9-5ad296cfe1fd.jpg?v=1782938756","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1ajx018000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}