{"product_id":"carrier-lc748lccsrly2600-transformer-h301d7","title":"OEM Carrier 40VA Transformer 120V–24V for LC748LCCSRLY2600","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 120V–24V for Model LC748LCCSRLY2600\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier LC748LCCSRLY2600\u003c\/strong\u003e. Its job is to step down the 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control wiring. When it fails, absolutely nothing in the control circuit responds — the thermostat goes blank, the system refuses to start, and no error codes appear because the board itself has no power to generate them.\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 protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers like HT01BD702 are wound to Carrier's exact VA rating and thermal cutoff spec. Undersized generic units can overheat under normal control-circuit load, triggering nuisance shutdowns or early failure — especially in multi-stage or zoned systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all low-voltage and line-voltage wiring connections before removing the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits Carrier model \u003cstrong\u003eLC748LCCSRLY2600\u003c\/strong\u003e. Always verify the input voltage, output voltage, and VA rating on your unit's data plate or existing transformer label before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — reach out with your full model and serial number and we'll confirm the correct part.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909295493491,"sku":"CARRIE-LC748LCCSRLY2600-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909295526259,"sku":"CARRIE-LC748LCCSRLY2600-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_6d5630e6-7919-4daa-bff8-7774b4116d45.jpg?v=1782899687","url":"https:\/\/nationalhvacparts.com\/products\/carrier-lc748lccsrly2600-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}