{"product_id":"carrier-fc4dnf018000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FC4DNF018000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FC4DNF018000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FC4DNF018000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage from 120V to the 24V AC signal required by the control circuit, thermostat, and all low-voltage components. When the transformer fails, the entire control system goes dark — the thermostat displays nothing, the unit won't respond to any call for heating or cooling, and no low-voltage components operate. A failed transformer is often mistaken for a bad control board, so always confirm 24V output at the secondary before replacing any other components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V secondary output | Direct OEM replacement for part number HT01CN241 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications for the Carrier FC4DNF018000AAAA. Generic substitutes may lack internal thermal fusing, putting your control board and low-voltage wiring at risk during a fault condition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Test for 24V output at secondary terminals after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse stock.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFC4DNF018000AAAA\u003c\/strong\u003e fan coil unit. Confirm primary voltage (120V) and VA rating on your unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists can verify compatibility before you purchase — same-day shipping available on all in-stock orders placed before 3 PM local time.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909524115827,"sku":"CARRIE-FC4DNF018000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909524148595,"sku":"CARRIE-FC4DNF018000AAAA-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_4ce26bdf-43cf-4c22-be80-982ec4ce5e36.jpg?v=1782939567","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnf018000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}