{"product_id":"carrier-fb4bnf036010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4BNF036010AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model FB4BNF036010AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier FB4BNF036010AAAA\u003c\/strong\u003e fan coil air handler. The transformer converts 120V line voltage down to the 24V AC signal that powers your control board, thermostat, and all low-voltage control circuits. When the transformer fails, the entire control circuit loses power — the thermostat goes dark, the system won't respond to any calls for heating or cooling, and no safety safeties or relays will energize. A failed transformer is often misdiagnosed as a bad control board, so always verify 24V output at the secondary terminals before replacing more expensive components.\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 output tolerance for reliable low-voltage circuit performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and rated to exact Carrier specifications. Generic transformers often carry inferior core materials and loose VA ratings, which can cause voltage sag under load, leading to nuisance lockouts and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label all wiring before removal. Verify 24V output with a multimeter after installation before restoring full system power.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eFB4BNF036010AAAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on all in-stock orders placed before 3 PM local time.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909540663667,"sku":"CARRIE-FB4BNF036010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909540696435,"sku":"CARRIE-FB4BNF036010AAAA-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_d4e303bc-3bae-4660-b92b-8e825a53dc6e.jpg?v=1782939494","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4bnf036010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}