{"product_id":"carrier-c48a903564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A903564","description":"\u003ch1\u003eOEM Carrier Control Circuit Transformer 40VA for Model C48A903564\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C48A903564\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal required to power the thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat display may go blank, the system will not respond to any calls for heating or cooling, and nothing will operate despite power being present 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 design | Replaces OEM part number HT01BD702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM transformer is wound to exact VA and voltage specifications for the C48A903564 control board. Undersized or off-tolerance generic transformers can overload under simultaneous relay demand, causing nuisance tripping or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.\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 Carrier \u003cstrong\u003eC48A903564\u003c\/strong\u003e packaged unit. Always verify your unit's control circuit voltage and VA requirements against your data plate before ordering. Our parts specialists are available to confirm fitment prior to purchase — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909719511411,"sku":"CARRIE-C48A903564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909719544179,"sku":"CARRIE-C48A903564-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_a2b15b3c-63d5-4eb7-9223-915db409d8a5.jpg?v=1782940311","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a903564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}