{"product_id":"carrier-fx4dnf031t00abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120\/24V for FX4DNF031T00ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FX4DNF031T00ABAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (Part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier FX4DNF031T00ABAA\u003c\/strong\u003e air handler. It steps down 120V line voltage to 24V AC to power the control circuit, thermostat, and low-voltage components throughout your HVAC system. When this transformer fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing works. A failed transformer is often the last thing technicians check, but it's one of the most common causes of a completely unresponsive system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Replaces OEM Part# HT01CN241 | Factory-matched output for stable, reliable low-voltage control power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine factory OEM part. Generic transformers frequently underperform on VA rating, causing voltage sag under load that leads to intermittent lockouts, nuisance tripping of low-voltage fuses, and premature failure of downstream control boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label all wiring before disconnecting. Check and replace any blown inline 3A or 5A low-voltage fuse before restoring power.\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 Engineered as the direct factory replacement for the \u003cstrong\u003eCarrier FX4DNF031T00ABAA\u003c\/strong\u003e residential air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are 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":62909476471155,"sku":"CARRIE-FX4DNF031T00ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909476503923,"sku":"CARRIE-FX4DNF031T00ABAA-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_add3a352-69db-497d-882d-f60d66b340f1.jpg?v=1782938666","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf031t00abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}