{"product_id":"carrier-c48a402551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C48A402551 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A402551\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A402551\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V signal needed to power the control board, thermostat circuit, and all low-voltage components. When this part fails, the entire control circuit goes dead — the thermostat shows no response, the system won't call for heating or cooling, and no error codes are displayed because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Factory-matched OEM replacement | Designed for Carrier C48A402551 packaged unit control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier factory control board. Undersized or off-spec generic units can overheat, blow fuses repeatedly, or cause erratic low-voltage behavior that mimics other faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before removal. Verify 24V output with a multimeter after installation before restoring power to the full system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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\u003eC48A402551\u003c\/strong\u003e packaged unit. Always verify your unit's control circuit voltage requirements against your data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909745234291,"sku":"CARRIE-C48A402551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909745267059,"sku":"CARRIE-C48A402551-TRANSFORMER-HT01BD236-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-HT01BD236_7fda9a23-a11c-41c9-af4c-c9c537910f6f.jpg?v=1782939195","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a402551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}