{"product_id":"carrier-c4850c50z3090610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z3090610 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50Z3090610\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z3090610\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, the entire control system goes dark: the thermostat loses power, nothing responds to calls for heating or cooling, and no fault codes can even be generated. It is often the first component to check when a system appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched primary and secondary windings for stable low-voltage output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-spec generic transformers can overheat under full control-circuit load, tripping the internal fuse and causing repeat failures — especially in systems with multiple accessories drawing 24V power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Confirm input and output voltages with a meter before reassembling the cabinet. Label all low-voltage wires before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C50Z3090610\u003c\/strong\u003e packaged unit. Always verify your existing transformer's input voltage, output voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase — reach out before you order and we'll verify the part.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909787505011,"sku":"CARRIE-C4850C50Z3090610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909787537779,"sku":"CARRIE-C4850C50Z3090610-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_f15ae416-585a-473c-a92a-4c5be6b64302.jpg?v=1782899191","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3090610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}