{"product_id":"carrier-fx4dnf037t10abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FX4DNF037T10ABAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FX4DNF037T10ABAA\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 FX4DNF037T10ABAA\u003c\/strong\u003e fan coil air handler. The transformer steps line voltage down from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead: the thermostat loses power, the system won't respond to calls for heating or cooling, and nothing turns on. A failed transformer is often mistaken for a bad thermostat or control board, so always verify 24V output at the secondary terminals before replacing other components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Carrier transformer, wound to exact factory VA and voltage specifications. Generic transformers may undervolt the control circuit, causing erratic thermostat behavior, nuisance lockouts, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and air handler disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. Confirm 120V primary input and verify 24V output after installation before closing the cabinet.\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 for the Carrier \u003cstrong\u003eFX4DNF037T10ABAA\u003c\/strong\u003e fan coil air handler. Verify primary voltage and VA rating on your unit's data plate before ordering. If you're unsure of fitment, our parts specialists confirm compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909474799987,"sku":"CARRIE-FX4DNF037T10ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909474832755,"sku":"CARRIE-FX4DNF037T10ABAA-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_3db15950-c6e6-44eb-acfd-e8aafe09f567.jpg?v=1782941222","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf037t10abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}