{"product_id":"carrier-c48a802564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A802564","description":"\u003ch1\u003eOEM Carrier Control Circuit Transformer 40VA for Model C48A802564\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A802564\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V required by your thermostat, control board, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit goes dark — your thermostat displays nothing, the system won't respond to any calls for heating or cooling, and no safety or diagnostic functions operate. It is often the first component to check when a unit appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD702 | Factory-matched output for Carrier low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA ratings and insulation class. Generic transformers frequently under-deliver on VA capacity, causing voltage sag that triggers nuisance lockouts, control board errors, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before working. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal. Primary wires connect to line voltage — treat with appropriate caution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 as the direct OEM replacement for \u003cstrong\u003eCarrier C48A802564\u003c\/strong\u003e packaged units. Always confirm the VA rating and voltage specifications on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you purchase — reach out before you order and ship same day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909721379187,"sku":"CARRIE-C48A802564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909721411955,"sku":"CARRIE-C48A802564-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_7d8f1d11-e20b-4094-95cf-7297e8bd3466.jpg?v=1782940283","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a802564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}