{"product_id":"carrier-fb4cnf036l00adaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF036L00ADAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model FB4CNF036L00ADAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM replacement control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) factory-specified for the \u003cstrong\u003eCarrier FB4CNF036L00ADAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dark: your thermostat loses power, the system won't respond to any call for heating or cooling, and nothing happens when you adjust the setpoint. It is one of the first components to check when a unit is completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN241 | Direct factory-matched replacement for Carrier FB4CNF036L00ADAA air handlers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance generic units can overheat, trip internal fuses, or deliver unstable 24V output that causes nuisance lockouts and board damage over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify 24V output on secondary terminals after installation before closing the panel.\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 \u003cstrong\u003eCarrier FB4CNF036L00ADAA\u003c\/strong\u003e fan coil air handler. Always verify VA rating and primary\/secondary voltages on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — no guesswork, no return hassle.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909536895347,"sku":"CARRIE-FB4CNF036L00ADAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909536928115,"sku":"CARRIE-FB4CNF036L00ADAA-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_039a42a3-7d74-4d55-a77e-88550a90497a.jpg?v=1782939533","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf036l00adaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}