{"product_id":"carrier-c4850c50zn060500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZN060500 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C50ZN060500\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZN060500\u003c\/strong\u003e packaged gas\/electric unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and gas valve. When this component fails, the entire control circuit goes dark — the thermostat loses power, nothing responds, and the system will not attempt a heat or cool cycle. If you've confirmed 120V supply voltage at the unit but have no 24V at the secondary terminals, this transformer is almost certainly the cause.\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-wound core for precise voltage regulation under full control-circuit load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound to Carrier's exact VA and impedance specifications, ensuring stable 24V output even when all control loads (contactor coil, gas valve, board) are energized simultaneously. Undersized or off-tolerance generic transformers can sag voltage under load, causing random lockouts and nuisance trips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all 24V wire connections before removing the old unit. Verify 0V on primary terminals with your meter before touching any leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. 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 specifically for the Carrier \u003cstrong\u003eC4850C50ZN060500\u003c\/strong\u003e packaged unit. Always confirm your existing transformer's primary voltage, secondary voltage, and VA rating on the unit data plate or wiring diagram before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909771645299,"sku":"CARRIE-C4850C50ZN060500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909771678067,"sku":"CARRIE-C4850C50ZN060500-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_d5404a6f-b603-45ca-a785-d49a5912ba74.jpg?v=1782899245","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn060500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}