{"product_id":"carrier-fc4dnb048000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FC4DNB048000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FC4DNB048000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# HT01CN241) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FC4DNB048000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When it fails, the entire control circuit goes dark — the thermostat displays nothing, the system won't respond to calls for heating or cooling, and the unit sits completely inoperative despite line power being present.\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 | Direct plug-in wire harness replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact Carrier factory specifications, ensuring a stable 24V output under full load. Generic transformers frequently sag below 24V under demand, causing erratic control board behavior, nuisance lockouts, and premature component failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after installation). Photograph all low-voltage wiring connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3PM ship the same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for the Carrier \u003cstrong\u003eFC4DNB048000AAAA\u003c\/strong\u003e fan coil unit. Always verify your existing transformer's primary\/secondary voltage and VA rating on the unit data plate or old transformer label before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909524672883,"sku":"CARRIE-FC4DNB048000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909524705651,"sku":"CARRIE-FC4DNB048000AAAA-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_da618f0c-b4bc-49b0-8d53-d242d69e9e7b.jpg?v=1782940964","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnb048000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}