{"product_id":"carrier-fx4dnf025000abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FX4DNF025000ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FX4DNF025000ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FX4DNF025000ABAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and zone valves. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the air handler won't respond to any calls for heating or cooling, and in some cases a tripped secondary fuse is the only clue. Replacing this part is one of the most cost-effective first steps when diagnosing a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Hardwired leads | Factory-matched OEM dimensions and mounting footprint for direct drop-in fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to exact Carrier tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers often deliver inconsistent voltage under load, causing intermittent lockouts or nuisance tripping of the secondary fuse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections before disconnecting. Check and replace the 3A secondary fuse if the transformer failed due to a shorted wire — a new transformer will fail immediately if the short is not cleared first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3PM local time ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the \u003cstrong\u003eCarrier FX4DNF025000ABAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909478273395,"sku":"CARRIE-FX4DNF025000ABAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909478306163,"sku":"CARRIE-FX4DNF025000ABAA-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_d13e3f84-b1f1-4e51-8353-90caaa60225a.jpg?v=1782939672","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf025000abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}