{"product_id":"carrier-c48a303064-transformer-h301d7","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A303064 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C48A303064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A303064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the result is total system non-response: the thermostat goes dark, no contactors pull in, and the unit will not start under any call for heating or cooling. A failed transformer is often caused by a shorted control wire or failed component that drew excess current through the secondary winding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched windings for OEM control circuit protection | Includes mounting hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers (HT01BD702) are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause nuisance tripping, control board damage, or repeated transformer burnout.\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 (to verify 24V output after install). Always inspect low-voltage wiring for shorts before energizing the new 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 Engineered for the Carrier \u003cstrong\u003eC48A303064\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) on your unit's data plate before ordering. If your unit operates on 208\/240V primary, do not install this transformer. Our parts team is available to confirm fitment before you order — same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909751689587,"sku":"CARRIE-C48A303064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909751722355,"sku":"CARRIE-C48A303064-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_838c4711-bb62-4376-a2de-045ad4df65fe.jpg?v=1782899329","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a303064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}