{"product_id":"carrier-c48a805064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A805064 — HT01BD702","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A805064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC48A805064\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, \u003cem\u003enothing works\u003c\/em\u003e: the thermostat goes blank, the system won't respond to calls for heating or cooling, and you may measure zero voltage at the secondary terminals. A failed transformer is often caused by a short in the control wiring or a stuck contactor coil drawing excess current, so always inspect the downstream circuit before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Mounts via standard foot or stud bracket | OEM part number HT01BD702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation class, ensuring reliable 24V output under full control-circuit load. Generic transformers may be under-rated for VA draw, leading to thermal cutout trips and premature failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all wiring before removal. Test secondary output voltage after installation before closing the cabinet.\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\u003eC48A805064\u003c\/strong\u003e packaged unit. Verify your existing transformer's primary\/secondary voltage and VA rating on the unit's data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts team is available to verify compatibility before you purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909720625523,"sku":"CARRIE-C48A805064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909720658291,"sku":"CARRIE-C48A805064-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_a9d90265-4dbf-4fff-aad6-ad8a2866d462.jpg?v=1782940296","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a805064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}