{"product_id":"carrier-c48a504064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A504064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A504064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A504064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any commands, and nothing turns on. It is often the first component to diagnose when a unit has completely lost communication with the thermostat.\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 electrical tolerances for safe, reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation standards. Generic alternatives are frequently under-rated, leading to overheating, tripped fuses, or premature control board failure — making the OEM replacement the smarter long-term investment.\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 before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify output voltage after installation. Always photograph or label low-voltage wire connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C48A504064\u003c\/strong\u003e packaged unit. Verify your existing transformer's input\/output voltage and VA rating on the unit's data plate or wiring diagram before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required. Order today and get back to comfort fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909727572339,"sku":"CARRIE-C48A504064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909727605107,"sku":"CARRIE-C48A504064-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_793ce375-0a92-4922-ac97-338384df4d9c.jpg?v=1782940220","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a504064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}