{"product_id":"carrier-hc1ajx042000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HC1AJX042000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model HC1AJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eHC1AJX042000AAAA\u003c\/strong\u003e air handler. The transformer steps line voltage down from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is total system shutdown: the thermostat goes dark, nothing responds, and no call for heating or cooling is processed. A blown transformer is often traced to a shorted control wire, so inspect the low-voltage wiring carefully before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM construction | Part number HT01AW229\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Undersized or off-spec generic transformers can overheat, trip internal fuses, or deliver insufficient voltage to contactors and boards.\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, wire stripper, multimeter. Verify 24V output at secondary terminals after installation before restoring the full circuit. Always identify and correct any short that caused the original failure.\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 for the Carrier \u003cstrong\u003eHC1AJX042000AAAA\u003c\/strong\u003e air handler. Verify primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. If you are unsure of fitment, our technical team is available to confirm compatibility before you purchase. Order today and get same-day shipping on all in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909341794675,"sku":"CARRIE-HC1AJX042000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909341827443,"sku":"CARRIE-HC1AJX042000AAAA-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_c17b0392-32dd-4546-84c2-52b02dba1a2a.jpg?v=1782941582","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hc1ajx042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}