{"product_id":"carrier-c48a402752-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A402752 (HT01BD236) | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A402752\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) designed for the \u003cstrong\u003eCarrier C48A402752\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC required to power thermostats, contactors, control boards, and safety switches throughout the system. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system will not respond to any call for heating or cooling, and nothing appears to happen when the unit is switched on. It is one of the first components to check when diagnosing a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD236 | Factory-matched output voltage for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers frequently under-deliver on VA rating, causing nuisance tripping of fuses and premature control board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 24V output with a multimeter after installation before restoring full system power.\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 Engineered as a direct OEM drop-in replacement for \u003cstrong\u003eCarrier C48A402752\u003c\/strong\u003e packaged units. Always verify your existing transformer's primary\/secondary voltage and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — same-day shipping available on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909744054643,"sku":"CARRIE-C48A402752-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909744087411,"sku":"CARRIE-C48A402752-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_9659b45b-d846-4bb0-b2f2-0aa1593b0c32.jpg?v=1782899352","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a402752-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}