{"product_id":"carrier-c48a604064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V-24V for C48A604064","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C48A604064\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control circuit transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A604064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, absolutely nothing in the system responds — no thermostat display, no contactor pull-in, no staging — making it one of the first components to check when the system appears completely dead despite line voltage being present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BD702 | Factory-matched windings for precise voltage output under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances for the C48A604064 control circuit. Undersized or off-tolerance generic units can sag under load, causing intermittent lockouts or nuisance tripping of the secondary fuse.\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 starting. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter. Label all low-voltage wiring before disconnecting the old transformer.\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\u003eC48A604064\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you have questions about fitment, our HVAC parts specialists confirm compatibility before your order ships.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909724492147,"sku":"CARRIE-C48A604064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909724524915,"sku":"CARRIE-C48A604064-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_e65a037b-68d5-4a41-b044-e40d5790878c.jpg?v=1782939318","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a604064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}