{"product_id":"carrier-fx4dnf037t00abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FX4DNF037T00ABAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model FX4DNF037T00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier FX4DNF037T00ABAA\u003c\/strong\u003e air handler. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coils, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system fails to respond to any call for heating or cooling, and nothing works. It is one of the first components to check when a unit is completely unresponsive despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01CN241 | Factory-matched output for Carrier low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier transformer. Generic replacements may carry incorrect VA ratings or loose terminal fitment, risking control board damage or nuisance tripping of the secondary-side fuse. OEM ensures exact voltage output and physical fit.\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, multimeter. Verify 0V at primary terminals before touching wiring. Document all low-voltage wire connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 drop-in replacement for the Carrier \u003cstrong\u003eFX4DNF037T00ABAA\u003c\/strong\u003e air handler. Always verify your existing transformer's VA rating and voltage on the unit's data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909474865523,"sku":"CARRIE-FX4DNF037T00ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909474898291,"sku":"CARRIE-FX4DNF037T00ABAA-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_6c1ec6dc-d536-4f46-a58b-36e4c66050f9.jpg?v=1782939687","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf037t00abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}