{"product_id":"carrier-fc4dnf024010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FC4DNF024010AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FC4DNF024010AAAA\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 FC4DNF024010AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to 24V, powering the control board, thermostat, and all low-voltage switching circuits throughout the system. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and nothing operates despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01CN241 | Factory-matched output for full control circuit compatibility\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier transformer wound to exact VA and voltage tolerances. Generic transformers often run under-rated VA, causing thermal overloads, nuisance tripping, and premature control board failure — avoid the shortcut on this critical component.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Confirm 0V at primary terminals before handling. Photograph existing wiring connections before removal. Reconnect secondary leads to matching terminals on the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. 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 and factory-matched for the Carrier \u003cstrong\u003eFC4DNF024010AAAA\u003c\/strong\u003e fan coil unit. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage against your unit's data plate before ordering to confirm fitment. Have a question about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909523296627,"sku":"CARRIE-FC4DNF024010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909523329395,"sku":"CARRIE-FC4DNF024010AAAA-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_76d6d1f4-a768-4b1d-8eff-1668c573092b.jpg?v=1782939570","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnf024010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}