{"product_id":"carrier-fb4bnf060010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4BNF060010AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA for Model FB4BNF060010AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FB4BNF060010AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, nothing in the system responds: the thermostat goes dark, the air handler won't energize, and the system appears completely dead. It is one of the most overlooked yet critical components in any HVAC system.\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 to Carrier FB4BNF060010AAAA wiring and mounting configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers use factory-wound coils with proper VA ratings and thermal cutoffs. Undersized or off-spec generic units can overheat, trip on thermal overload, or introduce voltage fluctuations that damage control boards downstream.\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 spade connectors. Verify 24V output with a multimeter before reassembling the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eFB4BNF060010AAAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Our fitment team is available to verify compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909539713395,"sku":"CARRIE-FB4BNF060010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909539746163,"sku":"CARRIE-FB4BNF060010AAAA-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_a7612151-ec58-451d-9214-6baa57050ba0.jpg?v=1782940904","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4bnf060010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}