{"product_id":"carrier-c48a503561-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A503561","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C48A503561\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A503561\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat becomes unresponsive, the system won't call for heating or cooling, and no error codes will display because the board itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and thermal protection for safe, reliable operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers feature factory-calibrated VA ratings and built-in thermal cutoffs that match the original design specifications. Generic units often lack proper thermal protection, risking repeated failures or downstream board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before removing the old unit. Confirm 24V output with a multimeter after installation before restoring full 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 Designed for the Carrier \u003cstrong\u003eC48A503561\u003c\/strong\u003e packaged unit. Always verify primary voltage (120V), secondary voltage (24V), and VA rating on your unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you purchase — just reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909732094323,"sku":"CARRIE-C48A503561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909732127091,"sku":"CARRIE-C48A503561-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_25982277-2bea-45e6-b409-e1a62c9a9724.jpg?v=1782940207","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a503561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}