{"product_id":"carrier-c48a906064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A906064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A906064\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A906064\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V signal required to power the control board, thermostat, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — no thermostat response, no contactor pull-in, and no system operation whatsoever. If your system appears completely unresponsive despite confirmed line voltage at the unit, a failed transformer is among the first components to test.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Factory-matched impedance for Carrier C48A906064 control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain precise voltage output under varying load conditions. Generic units frequently sag under full control circuit load, causing intermittent lockouts, erratic board behavior, and premature contactor coil failure — issues that are difficult to diagnose and costly to chase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Label or photograph all low-voltage wiring connections at the board before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC48A906064\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists confirm fitment before every order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909717250419,"sku":"CARRIE-C48A906064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909717283187,"sku":"CARRIE-C48A906064-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_5ba5c1b9-caeb-45c5-8810-32d74867332d.jpg?v=1782940316","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a906064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}