{"product_id":"carrier-c48a302564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V Control Transformer for C48A302564 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A302564\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A302564\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the entire control system loses power: the thermostat goes blank, the unit won't respond to any calls for heating or cooling, and no fault codes will display. It is one of the first components to check when a unit appears completely unresponsive despite having line voltage present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched output tolerances for reliable low-voltage circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and voltage tolerances. Undersized or off-tolerance generic transformers can overheat, trip thermal protection, or deliver insufficient voltage to reliably pull in contactors and energize control boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label or photograph all low-voltage wiring before disconnecting. Confirm 24V output with a multimeter after installation before restoring full 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 Designed for the Carrier \u003cstrong\u003eC48A302564\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltage on the unit's data plate or wiring diagram before ordering. Our team is available to confirm fitment prior to purchase — don't hesitate to reach out. Order today and receive same-day shipping on all in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909754245491,"sku":"CARRIE-C48A302564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909754278259,"sku":"CARRIE-C48A302564-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_87d3a93f-d073-4c01-b019-f6ff8f26cfe8.jpg?v=1782938796","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a302564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}