{"product_id":"carrier-fb4bnf048008aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4BNF048008AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FB4BNF048008AAAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FB4BNF048008AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V AC to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control system loses power: the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no components will energize. A blown transformer is often caused by a short in the low-voltage wiring or a failed control board drawing excess current — always inspect the secondary circuit before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01CN241 | Factory-matched for Carrier FB4BNF048008AAAA air handlers\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, ensuring reliable 24V output under full control-circuit load. Generic transformers frequently under-deliver on VA rating, causing voltage sag, nuisance lockouts, and premature failure of downstream components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after installation before closing the unit. Note any blown low-voltage fuses and trace the short before powering up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for \u003cstrong\u003eCarrier FB4BNF048008AAAA\u003c\/strong\u003e fan coil air handlers. Confirm input voltage and VA rating on your unit's data plate before ordering. Need help verifying fitment? Our HVAC parts specialists confirm compatibility before your order ships — same-day if ordered before 3 PM.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909540204915,"sku":"CARRIE-FB4BNF048008AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909540237683,"sku":"CARRIE-FB4BNF048008AAAA-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_715e19ff-04b0-4f32-a146-42257ece9c71.jpg?v=1782939499","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4bnf048008aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}