{"product_id":"carrier-fx4cnf018005aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120\/24V for FX4CNF018005AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FX4CNF018005AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FX4CNF018005AAAA\u003c\/strong\u003e fan coil air handler. Its job is to step down 120V line voltage to 24V AC, which powers the control board, thermostat, and all low-voltage switching circuits throughout your system. When the transformer fails, the entire control circuit goes dark — your thermostat will be unresponsive, your air handler will not start, and no heating or cooling calls will be processed. A failed transformer is often the first thing to suspect when absolutely nothing responds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM Part Number: HT01CN241 | Factory-matched output tolerance for reliable low-voltage operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the factory OEM unit — built to exact VA rating and insulation class required by Carrier. Generic transformers often underrate their VA capacity, leading to overheating under normal HVAC control loads and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always confirm primary and secondary wiring connections match original routing before restoring power.\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 specifically for the Carrier \u003cstrong\u003eFX4CNF018005AAAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and voltage specs on the unit data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909485711731,"sku":"CARRIE-FX4CNF018005AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909485744499,"sku":"CARRIE-FX4CNF018005AAAA-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_de057342-6e50-4ad5-8ac4-6be0c080a77f.jpg?v=1782938658","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4cnf018005aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}