{"product_id":"carrier-fa4cnf042015aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FA4CNF042015AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FA4CNF042015AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eFA4CNF042015AAAA\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 this component fails, nothing in the system responds: the thermostat goes blank, the blower won't start, and the entire unit appears completely dead. It is one of the first components to check when diagnosing a total system shutdown with no obvious cause.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary input | 24V secondary output | Factory-matched windings and core spec for Carrier FA4CNF042015AAAA air handler applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to exact Carrier factory specifications, ensuring proper VA capacity to handle all connected 24V loads simultaneously. Undersized or off-spec generic transformers can overheat, trip thermal cutoffs, and damage connected control boards — making OEM the only reliable choice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, and a multimeter to confirm 24V output after installation. Label all low-voltage wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3 PM ET ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFA4CNF042015AAAA\u003c\/strong\u003e fan coil air handler. Always verify the existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm fitment. Not sure if this is the right part? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909547020659,"sku":"CARRIE-FA4CNF042015AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909547053427,"sku":"CARRIE-FA4CNF042015AAAA-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_998730d7-29ad-4883-a90c-39fcb6a5934a.jpg?v=1782940879","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4cnf042015aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}