{"product_id":"carrier-c48a305064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A305064 | HT01BD702 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A305064 — Part HT01BD702\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A305064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat, control board, contactor coil, and all low-voltage system controls. When this transformer fails, the entire control circuit goes dead — your thermostat will be unresponsive, the system won't heat or cool, and no error codes will display because the board itself has no power. It is one of the first components to check when a unit is completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120VAC | Secondary voltage: 24VAC | VA rating: 40VA | OEM part number: HT01BD702 | Factory-matched for Carrier C48A305064\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage specifications. Generic transformers with undersized VA ratings can overheat under normal HVAC control loads, leading to premature failure and 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 beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label all wires before disconnecting. Secondary fuse should also be inspected and replaced if blown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our HVAC parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the \u003cstrong\u003eCarrier C48A305064\u003c\/strong\u003e packaged unit. Always verify your existing transformer's primary\/secondary voltage and VA rating against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909746348403,"sku":"CARRIE-C48A305064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909746381171,"sku":"CARRIE-C48A305064-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_530b5ba7-c4cc-4695-ac51-6a82313483cb.jpg?v=1782939175","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a305064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}