{"product_id":"carrier-fy5bnf048t10aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FY5BNF048T10AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FY5BNF048T10AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eFY5BNF048T10AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V DC signal required by the thermostat, control board, and all low-voltage control circuits. When it fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any commands, and in some cases the secondary fuse will blow repeatedly if a short downstream is present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01CN241 | Factory-matched output tolerance for reliable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic substitutes often underrate their VA capacity, causing overheating and premature failure when multiple 24V accessories (humidifiers, zoning boards) are on the circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Always label or photograph wiring connections before disconnecting the old transformer.\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 for the Carrier \u003cstrong\u003eFY5BNF048T10AAAA\u003c\/strong\u003e fan coil unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909457564019,"sku":"CARRIE-FY5BNF048T10AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909457596787,"sku":"CARRIE-FY5BNF048T10AAAA-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_13cb10b4-3af1-4ad7-ab93-1ba1a2dc8062.jpg?v=1782941289","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy5bnf048t10aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}