{"product_id":"carrier-c48a402764-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A402764 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C48A402764\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A402764\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to the 24V required by your thermostat, control board, contactor coil, and all other low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and nothing operates. It is often the first component to check when a unit shows absolutely no sign of life despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BD702 | Factory-matched output for Carrier C48A402764 control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the factory control board. Undersized or off-tolerance generic transformers can overload, trip internal thermal protection repeatedly, or fail to hold 24V under full control circuit load — leading to erratic system behavior and callbacks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box and confirm voltage is absent with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Note wire colors and terminal positions before removing the old transformer.\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 specifically for the Carrier \u003cstrong\u003eC48A402764\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If your system is tripping the transformer repeatedly, inspect the 24V circuit for shorts before installing a new unit. Need help confirming fitment? Our HVAC parts team verifies compatibility before you order — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909740679539,"sku":"CARRIE-C48A402764-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909740712307,"sku":"CARRIE-C48A402764-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_2764fe3f-e084-4310-90ff-2a5fe5bdac8f.jpg?v=1782939207","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a402764-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}