{"product_id":"carrier-c48a203551-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C48A203551 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A203551\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C48A203551\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V low-voltage signal used by your thermostat, contactor coil, and control board. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no components energize. A failed transformer is often the first suspect when nothing works at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V | Secondary: 24V | Industry-standard footprint | OEM part number HT01BD236\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 tolerances required by the C48A203551 control circuit. Generic transformers with undersized VA ratings can overheat under full control-circuit load, leading to repeated failures and potential board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire nuts or quick-connect terminals, multimeter. Label all wires before disconnecting. Output should read 24–28V AC when energized.\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 Designed for the Carrier \u003cstrong\u003eC48A203551\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating on your existing transformer's label before ordering. If your unit runs a 208\/240V primary, do not use this part — contact our team to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you order — get the right part the first time and have your system back up today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909760536947,"sku":"CARRIE-C48A203551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909760569715,"sku":"CARRIE-C48A203551-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_93ec7625-fe47-439d-92a6-3ff7bd35bbe6.jpg?v=1782899276","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a203551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}