{"product_id":"carrier-fx4dnf037l10abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FX4DNF037L10ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V-24V for Model FX4DNF037L10ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FX4DNF037L10ABAA\u003c\/strong\u003e air handler. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, control board, and contactor coil. When this component fails, the entire system goes dark: the thermostat loses power, no calls for heating or cooling are processed, and the unit will not operate at all. A faulty transformer is often diagnosed by checking for 24V output at the secondary terminals with a multimeter; zero output with 120V input confirms transformer failure.\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 tolerance for stable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring full ampacity for all low-voltage loads. Generic transformers are frequently undersized in VA capacity, causing overheating, nuisance breaker trips on the secondary circuit, and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts. Label all 24V wiring connections before removing the old unit. Confirm 120V input and 24V output after installation before closing the cabinet.\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 NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the Carrier \u003cstrong\u003eFX4DNF037L10ABAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or existing part label before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909475291507,"sku":"CARRIE-FX4DNF037L10ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909475324275,"sku":"CARRIE-FX4DNF037L10ABAA-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_d81d2a64-68c1-4797-ac0b-8037286c7034.jpg?v=1782939684","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf037l10abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}