{"product_id":"carrier-c48a202564-transformer-h301d7","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A202564 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A202564\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# HT01BD702) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A202564\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, contactor coil, control board, and all low-voltage control circuits. When it fails, the entire control system goes dark — the thermostat loses power, the unit won't respond to any call for heating or cooling, and no error codes are produced because the board itself has no power. A failed transformer is often misdiagnosed as a thermostat or control board failure, making correct identification critical before replacing more expensive components.\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 output tolerance for reliable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine Carrier OEM transformer, wound and rated to exact factory specifications. Generic transformers often use undersized cores that overheat under full VA load, leading to premature failure and potential damage to connected control boards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter. Note wire colors and terminal labels before disconnecting. Confirm VA and voltage ratings match your unit's data plate.\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 Fits Carrier model \u003cstrong\u003eC48A202564\u003c\/strong\u003e packaged unit. Always verify the 120V primary and 24V secondary voltage ratings and the 40VA capacity on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909760766323,"sku":"CARRIE-C48A202564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909760799091,"sku":"CARRIE-C48A202564-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.jpg?v=1782899268","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a202564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}