{"product_id":"carrier-hc1ajx030000aaaa-transformer-h4oyjb","title":"OEM Carrier Transformer 40VA 120V\/24V for HC1AJX030000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model HC1AJX030000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01AW229\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eHC1AJX030000AAAA\u003c\/strong\u003e system. Its sole but critical job is converting 120V line voltage down to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — your thermostat goes blank, nothing responds to a call for heating or cooling, and the system sits completely unresponsive. It is often the first component to check when a system appears completely dead despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01AW229 | Factory-matched electrical tolerances for reliable control circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring the control board and thermostat receive clean, stable 24V power. Undersized or off-tolerance generic transformers can cause erratic thermostat behavior, nuisance lockouts, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections before removal. Verify 120V input and 24V output with a multimeter after install before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for Carrier model \u003cstrong\u003eHC1AJX030000AAAA\u003c\/strong\u003e. Always verify your unit's control board wiring diagram and confirm 40VA 120V\/24V transformer specification on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment before you purchase — no guesswork required. Order today and receive same-day shipping on in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909342777715,"sku":"CARRIE-HC1AJX030000AAAA-TRANSFORMER-HT01AW229","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909342810483,"sku":"CARRIE-HC1AJX030000AAAA-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_fe760bd6-19d5-4b6d-9e85-6f1dffdc2870.jpg?v=1782941580","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hc1ajx030000aaaa-transformer-h4oyjb","provider":"National HVAC Parts","version":"1.0","type":"link"}