{"product_id":"carrier-c48a902564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A902564","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C48A902564\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A902564\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your control board, thermostat, contactor coil, and every other low-voltage component in the system. When it fails, absolutely nothing works — the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may find a blown fuse on the control board from a secondary-side short.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 rated | OEM part number HT01BD702 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to Carrier's exact VA and impedance spec, ensuring stable 24V output under full contactor-coil load. Undersized generic transformers sag under load, causing intermittent lockouts and nuisance tripped fuses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify voltage is absent with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always label or photograph wire connections before removing the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC48A902564\u003c\/strong\u003e packaged unit. Confirm your existing transformer's primary voltage (120V) and VA rating (40VA) on the unit's data plate or the transformer label before ordering. If you are unsure of fitment, our HVAC parts specialists verify compatibility before you buy — no guesswork required. Order today and get back up and running fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909719871859,"sku":"CARRIE-C48A902564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909719904627,"sku":"CARRIE-C48A902564-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_36ec00c2-62c6-40c4-a25a-40463771ae48.jpg?v=1782940303","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a902564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}