{"product_id":"carrier-fy5bnf048015aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FY5BNF048015AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FY5BNF048015AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FY5BNF048015AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage from 120V to the 24V AC signal required by your thermostat, control board, contactor coil, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — your thermostat loses power, the system won't respond to any calls for heating or cooling, and nothing operates. A failed transformer is one of the most common causes of a completely unresponsive HVAC system and is often misdiagnosed as a control board failure.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01CN241 | Factory-matched output for stable low-voltage control circuit performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and tested to Carrier's exact VA and voltage specifications. Generic transformers frequently deliver inconsistent 24V output, causing erratic thermostat behavior, contactor chatter, and premature control board failure — making OEM the clear choice for long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always photograph existing wiring connections before disconnecting. Test output voltage after install before reassembling the panel.\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 specifically for the Carrier \u003cstrong\u003eFY5BNF048015AAAA\u003c\/strong\u003e fan coil unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions. Order today and your part ships same business day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909457990003,"sku":"CARRIE-FY5BNF048015AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909458022771,"sku":"CARRIE-FY5BNF048015AAAA-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_590d1952-83fb-4af5-8ee2-c368dfb62cee.jpg?v=1782939767","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy5bnf048015aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}