{"product_id":"carrier-c50a202564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A202564","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A202564\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A202564\u003c\/strong\u003e commercial packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and no components energize. It is one of the first components to check when a system appears completely dead despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM construction | Spade or wire-lead termination per OEM design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM part — not an aftermarket substitute. OEM transformers are wound and insulated to exact VA and thermal specifications. Undersized or off-tolerance generic transformers can overheat, blow the 3A control fuse repeatedly, or cause erratic board behavior that mimics more expensive failures.\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, wire stripper, multimeter. Confirm 24V output at secondary terminals after install before re-energizing the full system. Always check for a shorted control circuit that may have caused the original failure.\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 Engineered and tested for the \u003cstrong\u003eCarrier C50A202564\u003c\/strong\u003e commercial rooftop\/packaged unit. Always verify your unit's control voltage and VA requirement on the data plate before ordering. Not sure it's the right part? Our HVAC parts specialists confirm fitment before you buy — no guesswork, no costly returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909714497907,"sku":"CARRIE-C50A202564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909714530675,"sku":"CARRIE-C50A202564-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_db29feed-ef62-4003-8658-4a2b0aaa6eb5.jpg?v=1782940331","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a202564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}