{"product_id":"carrier-c48a405063-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A405063 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A405063\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A405063\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat displays nothing, the system won't respond to calls for heating or cooling, and no fault codes are generated because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM replacement | Class 2 low-voltage output | Designed for Carrier C48A405063 packaged unit applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD702 transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Generic transformers with loose tolerances can under-deliver current under load, causing nuisance lockouts and premature contactor coil wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade terminals, multimeter. Photograph all wiring connections before removal. Swap primary and secondary leads one at a time to avoid miswiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3PM ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C48A405063\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. If your system shares a common 40VA 120V\/24V transformer configuration, confirm the OEM part number HT01BD702 against your unit's parts list. Our HVAC parts specialists are available to verify fitment before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909738287475,"sku":"CARRIE-C48A405063-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909738320243,"sku":"CARRIE-C48A405063-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_c33c2395-9461-4580-a6c6-daf40611b097.jpg?v=1782939239","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a405063-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}