{"product_id":"carrier-fb4cnf024t05abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF024T05ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4CNF024T05ABAA 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 FB4CNF024T05ABAA\u003c\/strong\u003e air handler. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When it fails, the entire control system goes silent — the thermostat goes blank, the air handler won't respond to any commands, and no heating or cooling function can be initiated. A failed transformer is often misdiagnosed as a bad control board, so always test the transformer first before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement | Part number HT01CN241 | Factory-matched output voltage tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards from under- or over-voltage conditions. Generic units may sag under load, causing intermittent lockouts and premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring before disconnecting terminals.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFB4CNF024T05ABAA\u003c\/strong\u003e fan coil air handler. Verify part number HT01CN241 against your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909538369907,"sku":"CARRIE-FB4CNF024T05ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909538402675,"sku":"CARRIE-FB4CNF024T05ABAA-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_55cb9ad1-e254-4b33-88ce-947f3e4199e3.jpg?v=1782939514","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf024t05abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}