{"product_id":"carrier-c48a703564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V-24V for C48A703564","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V to 24V for Model C48A703564\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C48A703564\u003c\/strong\u003e packaged unit. Its job is to convert 120V line voltage down to the 24V signal voltage that powers your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dark — your thermostat goes blank, the system becomes completely unresponsive, and no heating or cooling function is possible.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated capacity | 120V primary \/ 24V secondary | Class 2 transformer | Factory-matched OEM part number HT01BD702 | Designed for Carrier packaged unit control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and insulated to Carrier's exact specifications, ensuring proper VA capacity and long-term thermal stability. Undersized or off-brand transformers can overheat under normal load, blow internal fuses, and take downstream components with them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, and a multimeter to confirm 24V output after installation. Label or photograph existing wiring before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e This transformer is engineered specifically for the Carrier \u003cstrong\u003eC48A703564\u003c\/strong\u003e packaged unit. Before ordering, verify the VA rating and primary\/secondary voltages on your unit's wiring diagram or data plate. If you're unsure of fitment, our HVAC parts specialists confirm compatibility before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909723738483,"sku":"CARRIE-C48A703564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909723771251,"sku":"CARRIE-C48A703564-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_89e6befe-1234-45e0-88e0-ac21da305da4.jpg?v=1782939322","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a703564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}