{"product_id":"carrier-lc748lccsrmp2600-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for LC748LCCSRMP2600","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model LC748LCCSRMP2600\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier LC748LCCSRMP2600\u003c\/strong\u003e. The control transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, control board, contactor coil, and safety switches. When it fails, the result is total control system shutdown: the thermostat goes blank, the system won't respond to calls for heating or cooling, and no low-voltage components receive power. A failed transformer is often misdiagnosed as a control board failure, making this an important first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD702 | Factory-matched impedance and thermal overload protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers can sag under load, causing intermittent lockouts, nuisance tripping, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 24V output with a meter after installation before restoring system operation. Always label wires before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 \u003cstrong\u003eLC748LCCSRMP2600\u003c\/strong\u003e. Verify transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. If you're unsure of fitment, our team is available to confirm compatibility before you buy — orders placed before 3 PM ship the same business day.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909292740979,"sku":"CARRIE-LC748LCCSRMP2600-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909292773747,"sku":"CARRIE-LC748LCCSRMP2600-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_33f22194-4814-419b-bf06-e5a05b20642c.jpg?v=1782941711","url":"https:\/\/nationalhvacparts.com\/products\/carrier-lc748lccsrmp2600-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}