{"product_id":"carrier-fx4dnf049000abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FX4DNF049000ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FX4DNF049000ABAA Air Handler\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FX4DNF049000ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the result is a completely unresponsive system: the thermostat goes blank, the air handler refuses to start, and no 24V signal reaches any component downstream. A blown fuse on the secondary side or a shorted control wire can also take out the transformer, so always check for shorts before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Hardwired leads | OEM part number HT01CN241 | Factory-matched to Carrier FX4DNF049000ABAA electrical specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, trip thermal cutouts prematurely, or deliver unstable 24V that causes erratic thermostat and board behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify voltage is off before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Measure 24V output on the secondary leads before buttoning up the air handler to confirm proper operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eFX4DNF049000ABAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909472801139,"sku":"CARRIE-FX4DNF049000ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909472833907,"sku":"CARRIE-FX4DNF049000ABAA-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_86b72074-7fef-41e9-82dc-7755aad4c319.jpg?v=1782941237","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf049000abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}