{"product_id":"carrier-fc4dnf024000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FC4DNF024000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FC4DNF024000AAAA\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 FC4DNF024000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control system loses power — resulting in a blank thermostat display, an unresponsive system, or a tripped secondary fuse with no obvious cause. If your Carrier fan coil appears completely dead despite confirmed line voltage at the unit, this transformer is one of the first components to test.\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 for stable low-voltage control circuit performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact Carrier factory tolerances, ensuring proper VA capacity and voltage regulation. Undersized or off-tolerance generic transformers can cause nuisance fuse trips, erratic thermostat behavior, and premature control board failure — making OEM the only safe choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdriver, multimeter, wire stripper. Label or photograph all low-voltage wiring before disconnecting. Verify secondary output reads 24–28V AC with a multimeter before closing up the panel.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFC4DNF024000AAAA\u003c\/strong\u003e fan coil unit. Always confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get back to comfort fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909523493235,"sku":"CARRIE-FC4DNF024000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909523526003,"sku":"CARRIE-FC4DNF024000AAAA-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_95da3f6e-f68e-480d-beaa-d18137ea2751.jpg?v=1782940969","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4dnf024000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}