{"product_id":"carrier-fc4dnb036000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FC4DNB036000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FC4DNB036000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FC4DNB036000AAAA\u003c\/strong\u003e fan coil unit. The transformer converts 120V line voltage to 24V AC, which powers the entire low-voltage control circuit — including the thermostat, control board, and zone controls. When the transformer fails, the result is total system unresponsiveness: the thermostat goes dark, nothing calls for heating or cooling, and the unit will not operate at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output for stable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to exact Carrier factory tolerances, ensuring steady 24V output under full load. Generic transformers often undervolt at peak demand, causing 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 to the unit at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 0V at the transformer terminals before touching wiring. Photograph all connections before disconnecting.\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 and factory-matched for the Carrier \u003cstrong\u003eFC4DNB036000AAAA\u003c\/strong\u003e fan coil unit. Confirm your existing transformer's VA rating and input\/output voltages on the data plate before ordering. Our fitment team is available to verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909524967795,"sku":"CARRIE-FC4DNB036000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909525000563,"sku":"CARRIE-FC4DNB036000AAAA-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_d641c9f1-32f5-483b-ad4e-ba3ec43bd986.jpg?v=1782939560","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnb036000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}