{"product_id":"carrier-fx4dnb043t00abaa-transformer-h3hwwy","title":"OEM Carrier 40VA Transformer HT01CN241 for FX4DNB043T00ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNB043T00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FX4DNB043T00ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing runs. It's often one of the first components to check when a system appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01CN241 | Direct factory replacement with matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers may be under-rated for VA load, causing premature overheating and failure — especially in systems with multiple 24V accessories like humidistats or zone controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always confirm 0V at the primary terminals before handling wiring. Photograph all connections before removing the old unit.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFX4DNB043T00ABAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our parts team is available to confirm compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909479944563,"sku":"CARRIE-FX4DNB043T00ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909479977331,"sku":"CARRIE-FX4DNB043T00ABAA-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_b994255d-d3f0-4172-b344-619898147115.jpg?v=1782900061","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnb043t00abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}