{"product_id":"carrier-lc748lccsrlyx2601-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for LC748LCCSRLYX2601","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model LC748LCCSRLYX2601\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier LC748LCCSRLYX2601\u003c\/strong\u003e system. The transformer steps down line voltage from 120V to 24V AC, powering the low-voltage control circuit that allows your thermostat, contactor coil, gas valve, and control board to communicate and operate. When the transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system produces no response to calls for heating or cooling, and nothing works. It is often the first component to check when a system appears completely dead with no obvious cause.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched output for stable low-voltage control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact Carrier factory specifications, ensuring precise 24V output under full VA load. Generic transformers may under-deliver voltage under load, causing erratic thermostat behavior, nuisance lockouts, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring connections at the secondary terminals before disconnecting. Verify 24V output with a multimeter after installation before restoring full system operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty included. 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 for the Carrier model \u003cstrong\u003eLC748LCCSRLYX2601\u003c\/strong\u003e. Always verify your existing transformer's VA rating and primary\/secondary voltage from the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — same-day shipping on all orders placed before 3PM local time.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909293789555,"sku":"CARRIE-LC748LCCSRLYX2601-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909293822323,"sku":"CARRIE-LC748LCCSRLYX2601-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_5e6a28fd-6ae6-48d4-b9cd-95da7fcc6878.jpg?v=1782941709","url":"https:\/\/nationalhvacparts.com\/products\/carrier-lc748lccsrlyx2601-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}