{"product_id":"carrier-c48a405064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A405064 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A405064 (HT01BD702)\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier C48A405064\u003c\/strong\u003e packaged system. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system will not respond to any calls for heating or cooling, and no safety safeties or relays can actuate. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Direct factory replacement with matched VA rating and terminal configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and impedance specs for the C48A405064 control circuit. Undersized or off-spec generic transformers can overheat, trip their internal breaker repeatedly, or damage the control board — OEM is the safe choice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Always label low-voltage wiring before removal.\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\u003eC48A405064\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltage on the data plate or wiring diagram before ordering. If your system has been upgraded or modified, confirm the OEM part number HT01BD702 against your unit's wiring schematic. Our fitment team is available to confirm compatibility before you order — same-day shipping on all stocked parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909738189171,"sku":"CARRIE-C48A405064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909738221939,"sku":"CARRIE-C48A405064-TRANSFORMER-HT01BD702-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-HT01BD702_799535a5-195b-43e6-8710-0e0085012dcd.jpg?v=1782939241","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a405064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}