{"product_id":"carrier-c50a804064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A804064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A804064\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A804064\u003c\/strong\u003e commercial packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, nothing in the control system responds: the thermostat goes blank, the unit won't call for heating or cooling, and the system appears completely dead despite line power being present.\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 for Carrier C50A804064 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA tolerances, ensuring stable 24V output under full control-circuit load. Generic transformers often deliver inconsistent secondary voltage, causing erratic board behavior, nuisance lockouts, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify incoming voltage and confirm 24V output before reinstalling the control panel. Photograph all wiring before disconnecting.\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\u003eC50A804064\u003c\/strong\u003e commercial rooftop\/packaged unit. Verify VA rating and primary\/secondary voltage on your unit's data plate before ordering. If your control board, thermostat, or contactors are unresponsive with line power confirmed, this transformer is the most common root cause. Our fitment team is available to confirm compatibility before you order — same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909662790003,"sku":"CARRIE-C50A804064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909662822771,"sku":"CARRIE-C50A804064-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_ebf807e7-c9a1-4e6a-81c7-12913f3126d7.jpg?v=1782940700","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a804064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}