{"product_id":"carrier-c48a305052-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C48A305052 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C48A305052\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C48A305052\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the control circuit — including the thermostat, contactor coil, and all safety switches. When the transformer fails, the entire control circuit loses power: the thermostat goes blank, nothing responds to a call for heating or cooling, and the system is completely inoperative. This is often one of the first components to inspect when a unit shows zero response despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | 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 OEM transformers are wound to exact VA and voltage tolerances required by Carrier. Generic substitutes often run under-rated VA, causing overheating, nuisance tripping, or premature failure — especially when multiple 24V accessories share the load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 120V input and 24V output after installation before restoring full system power. Photograph all wiring connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eC48A305052\u003c\/strong\u003e packaged unit. Confirm primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. If your system runs multiple 24V accessories such as zone boards or humidifiers, verify total VA load does not exceed transformer rating. Our parts specialists are available to confirm fitment before you order — contact us with your model and serial number.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909749428595,"sku":"CARRIE-C48A305052-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909749461363,"sku":"CARRIE-C48A305052-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_15f6429a-0898-4b61-b04e-1460f07d941f.jpg?v=1782899440","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a305052-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}