{"product_id":"carrier-c48a803064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A803064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A803064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A803064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V DC control circuit voltage required to power the thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dark — nothing responds, no call for heat or cool is processed, and the system appears completely dead at the thermostat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Class 2 transformer | OEM part number HT01BD702 | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications for the Carrier C48A803064 control circuit. Generic units may deliver slightly off-voltage output, causing erratic thermostat behavior, nuisance tripping of the secondary fuse, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed 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\u003eC48A803064\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you buy if you have any questions. \u003cstrong\u003eIn stock and ready to ship today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909720985971,"sku":"CARRIE-C48A803064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909721018739,"sku":"CARRIE-C48A803064-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_e834b3b8-34cb-4a5b-9235-f8722d3f76e3.jpg?v=1782940288","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a803064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}