{"product_id":"carrier-fb4cnf024t05acaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF024T05ACAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4CNF024T05ACAA Air Handler\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FB4CNF024T05ACAA\u003c\/strong\u003e fan coil 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 IFC board. When this part fails, the system goes completely silent: no thermostat response, no blower operation, and no error codes because the control board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched for Carrier FB4CNF024T05ACAA air handlers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and potted to exact VA tolerances, protecting downstream components like the control board and contactor coil. Undersized generic transformers can sag under load, causing intermittent lockouts and premature board failures.\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, needle-nose pliers, multimeter. Always verify 0V at the primary leads before disconnecting. Note wire colors before removal — a phone photo saves time on reinstall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and tested for the Carrier \u003cstrong\u003eFB4CNF024T05ACAA\u003c\/strong\u003e fan coil air handler. Verify your unit's control voltage and VA rating on the data plate before ordering. If you're unsure of fitment, our parts team can confirm compatibility using your model and serial number before you purchase.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909538173299,"sku":"CARRIE-FB4CNF024T05ACAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909538206067,"sku":"CARRIE-FB4CNF024T05ACAA-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_99ab1993-3b88-44ec-b7bb-8a99edce32ff.jpg?v=1782939516","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf024t05acaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}