{"product_id":"carrier-c50a803564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A803564","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C50A803564\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C50A803564\u003c\/strong\u003e commercial rooftop unit. The transformer converts 120V line voltage to the 24V AC signal that powers your control board, thermostat, contactor coils, and all low-voltage safety circuits. When the transformer fails, the entire control circuit loses power — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no fault codes will display. A failed transformer is often misdiagnosed as a bad control board, so always test transformer output voltage before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Factory-matched OEM replacement for part number HT01BD702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and voltage tolerance specifications. Generic transformers with undersized VA ratings can overheat under full control-circuit load, tripping thermal protection or failing prematurely — use OEM for long-term reliability on commercial equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade connectors. Verify 0V at primary terminals before handling. Photograph all wiring connections prior to removal and confirm secondary output reads 24V AC after installation.\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\u003eC50A803564\u003c\/strong\u003e commercial rooftop unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to ensure proper fitment. Have questions about compatibility? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909663117683,"sku":"CARRIE-C50A803564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909663150451,"sku":"CARRIE-C50A803564-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_8027b799-3dcc-4928-90fa-5eaa9038b78c.jpg?v=1782940697","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a803564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}