{"product_id":"carrier-c48a602564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A602564","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V to 24V for Model C48A602564\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A602564\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this part fails, the entire control circuit goes dead — the thermostat displays nothing, the system refuses to respond to any call for heating or cooling, and often a fuse or breaker may appear blown. It is one of the most overlooked yet critical components in any HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM part number HT01BD702 | Designed for continuous-duty control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and insulated to exact factory specifications, ensuring stable 24V output under full load. Generic units frequently produce voltage sag under load, causing erratic board behavior, nuisance lockouts, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 24V output on secondary terminals with a multimeter after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our NationalHVACParts.com warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the Carrier \u003cstrong\u003eC48A602564\u003c\/strong\u003e packaged unit. Always confirm your unit's data plate voltage requirements match 120V primary \/ 24V secondary 40VA before ordering. Not sure it fits? Our HVAC parts specialists verify fitment at no charge — contact us before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909724950899,"sku":"CARRIE-C48A602564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909724983667,"sku":"CARRIE-C48A602564-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_21e79c85-6a3f-436f-bc2f-79ea8169dc36.jpg?v=1782940250","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a602564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}