{"product_id":"carrier-ha1cjx042000abaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V-24V for HA1CJX042000ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model HA1CJX042000ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HA1CJX042000ABAA\u003c\/strong\u003e system. The transformer is the backbone of the low-voltage control circuit, stepping down 120V line voltage to the 24V signal used by your thermostat, contactor coil, control board, and all safety switches. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and nothing works. It is often the first component to check when a system shows zero response despite confirmed line voltage at the unit.\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 windings and core construction for reliable long-term output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Generic replacements often under-deliver on VA capacity, causing nuisance tripping of the secondary fuse or premature failure under full control circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Photograph existing wiring before disconnecting. Confirm 24V output with a multimeter before reassembling panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eHA1CJX042000ABAA\u003c\/strong\u003e. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm fitment. Need help verifying compatibility? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909354738035,"sku":"CARRIE-HA1CJX042000ABAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909354770803,"sku":"CARRIE-HA1CJX042000ABAA-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_cd1936f6-4217-45dc-a5b5-ef77cc65f79b.jpg?v=1782939890","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1cjx042000abaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}