{"product_id":"carrier-ha1cjx042000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HA1CJX042000AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V to 24V for Model HA1CJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier HA1CJX042000AAAA\u003c\/strong\u003e system. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit goes dark — your thermostat loses power, the system shows no response, and nothing operates. It is often the first part to check when a system appears completely dead with no error codes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM part number HT01AW229 | Compact chassis mount design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight voltage regulation under load, protecting sensitive control boards and thermostats from voltage sag or spike damage. Generic units can fluctuate under heavy relay switching, shortening the life of downstream components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after install. Label all wiring connections before removal and match wire gauge on reconnection.\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 This transformer is factory-specified for the Carrier \u003cstrong\u003eHA1CJX042000AAAA\u003c\/strong\u003e unit. Always verify your existing transformer's VA rating and primary\/secondary voltage from the data plate or wiring diagram before ordering to ensure a correct fit. Need help confirming compatibility? Our HVAC parts specialists verify fitment before you order — reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909355393395,"sku":"CARRIE-HA1CJX042000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909355426163,"sku":"CARRIE-HA1CJX042000AAAA-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_df8b5375-66d1-42fc-acd8-42fc690dd616.jpg?v=1782941546","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1cjx042000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}