{"product_id":"carrier-c4850c48ay04051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C48AY04051","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C48AY04051\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48AY04051\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, contactor coil, and every other low-voltage control circuit in the system. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system stops responding to calls for heating or cooling, and no fault codes appear because the board itself has no power to display them.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched for Carrier C4850C48AY04051 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to Carrier's exact VA and insulation specifications. Undersized or off-tolerance generic transformers can overheat under load, trip internal thermal protection, and cause intermittent control failures — costing more in diagnostic time than you save on the part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and confirm voltage is off with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire stripper, multimeter. Label or photograph all wiring connections before removal. Reconnect primary (line voltage) wires last.\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 Engineered as the factory-specified replacement for \u003cstrong\u003eCarrier C4850C48AY04051\u003c\/strong\u003e packaged units. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909880861043,"sku":"CARRIE-C4850C48AY04051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909880893811,"sku":"CARRIE-C4850C48AY04051-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_1bb72fce-737d-437e-88cb-50e186a3ea12.jpg?v=1782939266","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay04051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}