{"product_id":"carrier-c50a903064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A903064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A903064\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C50A903064\u003c\/strong\u003e commercial packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat will show no power, the system won't respond to any call for heating or cooling, and there will be no 24V signal reaching any downstream components. It is often the first component to inspect when a unit appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01BD702 | Factory-matched for Carrier C50A903064 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and insulated to Carrier's exact specifications, ensuring proper VA capacity and thermal protection. Generic transformers may be under-rated for VA load, leading to premature burnout under high-demand control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Label all wire connections before removal. Confirm no short circuit exists in the 24V control wiring before installing the new transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. 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 as a direct OEM replacement for the \u003cstrong\u003eCarrier C50A903064\u003c\/strong\u003e commercial rooftop\/packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. If your original transformer shows signs of burn marks or a blown fuse on the 24V circuit, inspect all downstream wiring for shorts prior to replacement. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909661905267,"sku":"CARRIE-C50A903064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909661938035,"sku":"CARRIE-C50A903064-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_3e5dc6bf-2ed2-4588-99f7-1cb5c20dace6.jpg?v=1782940714","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a903064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}