{"product_id":"carrier-c48a502064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V-24V for C48A502064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C48A502064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A502064\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal required by the thermostat, control board, contactor coil, and all other low-voltage control circuit components. When the transformer fails, the entire control circuit goes dark — the thermostat loses power, the contactor coil cannot energize, and the system will not respond to any call for heating or cooling. A shorted downstream component can also blow the secondary winding, so always inspect fuses and wiring before installing a replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 insulation | Replaces OEM part# HT01BD702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Generic transformers often underperform at 40VA load, causing voltage sag that triggers nuisance lockouts and premature control board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before removing the old unit. Verify no downstream short exists before energizing.\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\u003eC48A502064\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to verify compatibility prior to purchase — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909734224243,"sku":"CARRIE-C48A502064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909734257011,"sku":"CARRIE-C48A502064-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_24fb1c54-b820-40c7-918f-4a2d2f70c9f6.jpg?v=1782939305","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a502064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}