{"product_id":"carrier-c48a403064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A403064 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A403064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A403064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and every other low-voltage component in the control circuit. When it fails, the entire control system goes dead — no thermostat response, no fan, no heating or cooling — even though line voltage is present at the unit. A blown transformer is often caused by a short or grounded wire in the 24V circuit, so inspect low-voltage wiring thoroughly before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Replaces factory-installed unit with exact plug-and-play fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound to exact VA and impedance specifications. Off-brand transformers frequently underperform at rated load, causing nuisance tripping, brownouts on the 24V circuit, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), wire nuts or spade terminals. Confirm 24V output after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders received before cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC48A403064\u003c\/strong\u003e packaged unit. Verify your unit's control board accepts a 40VA 24V secondary transformer before ordering — check the data plate inside the control panel access door. Our fitment team is available to confirm compatibility prior to purchase. Order today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909740482931,"sku":"CARRIE-C48A403064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909740515699,"sku":"CARRIE-C48A403064-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_ad4c05c5-bb39-43fc-b464-a369b38911a1.jpg?v=1782939212","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a403064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}