{"product_id":"carrier-c50a902564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A902564","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C50A902564\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C50A902564\u003c\/strong\u003e commercial rooftop unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your entire control circuit — thermostat, contactors, control board, and safety switches. When this transformer fails, the result is typically complete system unresponsiveness: the thermostat goes dark, the unit will not start, and no control signals reach any component. A failed transformer is often misdiagnosed as a board failure, so always test secondary voltage (24V) at the transformer before replacing costlier components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications required by the C50A902564 control board. Undersized or off-tolerance generic units can overload under peak demand, causing nuisance tripping or premature failure of downstream controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 0V on primary leads before touching wiring. Label all control wires prior to disconnecting old unit.\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 specifically for the Carrier \u003cstrong\u003eC50A902564\u003c\/strong\u003e commercial rooftop packaged unit using OEM part HT01BD702. Always confirm primary voltage and VA rating on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909662331251,"sku":"CARRIE-C50A902564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909662364019,"sku":"CARRIE-C50A902564-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_99efabd9-4045-4488-b005-29b6b386cf01.jpg?v=1782940709","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a902564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}