{"product_id":"carrier-fc4dnf042010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 24V for FC4DNF042010AAAA — HT01CN241","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FC4DNF042010AAAA — Part# HT01CN241\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# HT01CN241) is the factory-specified replacement for the \u003cstrong\u003eCarrier FC4DNF042010AAAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and all relay coils. When it fails, the entire control system goes silent: your thermostat goes blank, the system won't respond to calls for heating or cooling, and no fault codes will display because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | Direct OEM replacement for part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e | Matches factory wiring terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact Carrier factory specifications for consistent 24V output under full load. Generic replacements often deliver unstable voltage that causes nuisance lockouts, contactor chatter, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the air handler before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm 24V output after installation before restoring thermostat wiring. Photograph all wiring connections before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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\u003eFC4DNF042010AAAA\u003c\/strong\u003e fan coil air handler. Verify your unit's data plate confirms 120V\/24V control transformer requirement and cross-reference OEM part number HT01CN241 before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909522542963,"sku":"CARRIE-FC4DNF042010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909522575731,"sku":"CARRIE-FC4DNF042010AAAA-TRANSFORMER-HT01CN241-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-HT01CN241_4b55b37c-0da3-4506-bb39-c9eae953fb86.jpg?v=1782942549","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnf042010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}