{"product_id":"carrier-fa4bnc030005aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FA4BNC030005AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FA4BNC030005AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FA4BNC030005AAAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the air handler won't energize, and the system appears completely dead even with power present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Factory-matched OEM replacement | Part No. HT01CN241 | Designed for Carrier FA4BNC030005AAAA air handler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory VA specifications, ensuring consistent 24V output under full control circuit load. Generic units often run undersized, causing intermittent control failures, nuisance lockouts, or premature burnout — especially in systems with multiple 24V accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminals. Verify 24V output after installation before closing the panel. Always confirm the primary fuse or breaker is off before touching any wiring.\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 NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eFA4BNC030005AAAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and voltage on the unit's data plate or wiring diagram before ordering. Our team is available to verify fitment — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909555179891,"sku":"CARRIE-FA4BNC030005AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909555212659,"sku":"CARRIE-FA4BNC030005AAAA-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_e146e883-16c6-4f4d-a24e-80fd94dc836d.jpg?v=1782940864","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4bnc030005aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}