{"product_id":"carrier-c48a702064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A702064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C48A702064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A702064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, and control board. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and you may blow a low-voltage fuse. Replacing the transformer is often the fastest fix for a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD702 | Factory-matched mounting footprint and lead configuration for direct drop-in fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance specifications for your Carrier unit. Undersized or off-spec generic transformers can overheat, trip thermal cutoffs prematurely, and leave your control board vulnerable to voltage sags under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Confirm polarity and secure all connections before restoring power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for \u003cstrong\u003eCarrier C48A702064\u003c\/strong\u003e packaged units. Always verify the VA rating, primary voltage, and secondary voltage on your existing transformer's label before ordering to confirm fitment. Need help? Our HVAC parts specialists verify compatibility before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909724098931,"sku":"CARRIE-C48A702064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909724131699,"sku":"CARRIE-C48A702064-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_f332dad1-e560-4b7d-97f5-0ec01a69554c.jpg?v=1782940265","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a702064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}