{"product_id":"carrier-fb4cnp025l00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4CNP025L00AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FB4CNP025L00AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FB4CNP025L00AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control system goes dark: the thermostat loses power, the system stops responding to calls for heating or cooling, and nothing works. A failed transformer is often misdiagnosed as a bad thermostat or control board, making it one of the most important components to verify early in any diagnostic.\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 output voltage and VA capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA tolerances, protecting downstream components like contactors and control boards from voltage fluctuation. Generic units with undersized VA ratings can overheat and fail prematurely, potentially damaging connected controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and verify with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wires before disconnecting and confirm polarity on the secondary 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 Engineered specifically for the Carrier \u003cstrong\u003eFB4CNP025L00AAAA\u003c\/strong\u003e fan coil air handler. Verify your unit's data plate shows 120V primary input and 24V secondary output before ordering. Our fitment specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909533946227,"sku":"CARRIE-FB4CNP025L00AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909533978995,"sku":"CARRIE-FB4CNP025L00AAAA-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_a859fd23-9676-4677-aa71-7b169a1028bd.jpg?v=1782940941","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnp025l00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}