{"product_id":"carrier-c48a503564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A503564","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A503564\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) designed specifically for the \u003cstrong\u003eCarrier C48A503564\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, \u003cem\u003enothing works\u003c\/em\u003e: the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may measure zero voltage on the secondary side of the control board. A blown transformer is often the first sign of a shorted wire or failed component downstream, so always inspect the control circuit before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched for Carrier C48A503564 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 and voltage specifications. Generic transformers frequently run undersized VA ratings that cause overheating, nuisance tripping, and premature failure — especially under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify zero voltage with a meter before touching any wiring. Note primary and secondary wire colors before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as the direct OEM replacement for Carrier model \u003cstrong\u003eC48A503564\u003c\/strong\u003e packaged units. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909731275123,"sku":"CARRIE-C48A503564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909731307891,"sku":"CARRIE-C48A503564-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_4197d658-d727-404e-8050-e8fb1c132927.jpg?v=1782940210","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a503564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}