{"product_id":"carrier-c48a705064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A705064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A705064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A705064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, absolutely nothing responds — the thermostat goes blank, the system won't call for heating or cooling, and no safety controls can operate. It is one of the first components to check in a completely unresponsive system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V secondary output | Direct OEM replacement | Matches factory mounting and lead configuration for \u003cstrong\u003eC48A705064\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers like HT01BD702 are wound to exact VA and voltage tolerances, protecting sensitive control boards from voltage fluctuations. Generic transformers often run under-rated VA, causing overheating and premature failure under full control-circuit load.\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 starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label or photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before 3PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C48A705064\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before you buy — reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909721641331,"sku":"CARRIE-C48A705064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909721674099,"sku":"CARRIE-C48A705064-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_ac787e53-e2b5-4662-86c3-83e26ac32629.jpg?v=1782940275","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a705064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}