{"product_id":"carrier-fx4dnb037l00acaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V–24V for FX4DNB037L00ACAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model FX4DNB037L00ACAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FX4DNB037L00ACAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, control board, and all safety switching. When this component fails, nothing in the system responds: the thermostat goes dark, the blower won't engage, and no call for heat or cool is processed. A failed transformer is often misdiagnosed as a bad control board, making this an important first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01CN241 | Matched to factory electrical specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound and insulated to Carrier's exact VA rating and thermal protection standards. Off-brand substitutes frequently under-deliver on VA capacity, causing nuisance tripping, overheating, or premature failure of the connected control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify voltage is absent with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label or photograph all wiring before disconnecting. A 5A control-circuit fuse is common on this platform — check and replace if blown alongside the transformer.\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 specifically for the \u003cstrong\u003eCarrier FX4DNB037L00ACAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909480337779,"sku":"CARRIE-FX4DNB037L00ACAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909480370547,"sku":"CARRIE-FX4DNB037L00ACAA-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_23558dfb-afb0-4e2a-8dd9-81f09dd6ef1f.jpg?v=1782941921","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4dnb037l00acaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}