{"product_id":"carrier-c48a306064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A306064 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C48A306064\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC48A306064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead — the thermostat shows no power, the system won't respond to any call for heating or cooling, and no components energize. Replacing the transformer is often the first diagnostic step when a unit shows zero control-circuit response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD702 | Factory-matched output tolerance for stable control-circuit voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to Carrier's exact VA rating and insulation class, ensuring reliable 24V output under full load. Generic units can sag under load, causing erratic thermostat behavior, nuisance lockouts, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Document or photograph all wiring connections before disconnecting the old transformer. Verify 24V output with a multimeter after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eC48A306064\u003c\/strong\u003e packaged unit. Confirm your unit's data plate lists a 40VA, 120V\/24V transformer before ordering. If you are unsure of fitment or have a variant model suffix, contact our parts team — we verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909745758579,"sku":"CARRIE-C48A306064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909745791347,"sku":"CARRIE-C48A306064-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_d63f1e2c-fbce-40b4-a896-a25d9790cecb.jpg?v=1782939182","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a306064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}