{"product_id":"carrier-fx4dnf025005abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FX4DNF025005ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FX4DNF025005ABAA\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 FX4DNF025005ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, and all low-voltage control components. When this transformer fails, the entire control circuit goes dark — your thermostat goes blank, nothing responds, and neither heating nor cooling can be initiated. Replacing it restores the 24V backbone that every component depends on.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary input | 24V secondary output | 40VA rated | OEM part number HT01CN241 | Factory-matched for Carrier FX4DNF025005ABAA fan coils\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Carrier transformer manufactured to exact VA and voltage tolerances. Generic transformers often run underrated VA capacity, causing thermal overloads when multiple 24V accessories (humidifiers, zone boards, UV lights) are connected — a common cause of repeat transformer failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label all low-voltage wiring before disconnecting. Confirm 24V output with a multimeter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship the 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\u003eFX4DNF025005ABAA\u003c\/strong\u003e fan coil air handler. Verify your unit's control circuit voltage and VA requirements on the data plate before ordering. If you are unsure about fitment, our HVAC parts specialists can confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909478175091,"sku":"CARRIE-FX4DNF025005ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909478207859,"sku":"CARRIE-FX4DNF025005ABAA-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_2664963d-8242-4b74-b731-ba003b76c1ce.jpg?v=1782941205","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf025005abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}