{"product_id":"carrier-fx4dnf037010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FX4DNF037010AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Transformer HT01CN241 for Model FX4DNF037010AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier FX4DNF037010AAAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coils, and all low-voltage control components. When this part fails, the entire control circuit goes dead — your thermostat loses communication, and nothing in the system responds. If you have 120V at the air handler but zero 24V at the control board, a failed transformer is the most common culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01CN241 | Direct factory replacement with matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and impedance specifications. Undersized or off-spec generic transformers can overload, trip their internal breaker repeatedly, or fail to power multiple zone valves simultaneously — especially problematic on multi-stage systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wiring before disconnecting. Verify primary voltage with a meter before energizing the replacement unit.\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\u003eFX4DNF037010AAAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our fitment team is available to verify compatibility — don't guess on a control circuit component. Order today for same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909475783027,"sku":"CARRIE-FX4DNF037010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909475815795,"sku":"CARRIE-FX4DNF037010AAAA-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_48b64c11-228f-4325-a642-6bb4973c03a7.jpg?v=1782939682","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnf037010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}