{"product_id":"carrier-c4850c50zn030500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN030500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50ZN030500\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZN030500\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls 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 Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD236 | Factory-matched for Carrier packaged unit applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the control board. Undersized or off-tolerance generic units can cause nuisance tripping, blown fuses, or premature control board failure — not a risk worth taking on a critical low-voltage circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm voltage is zero with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Label all wires before disconnecting from existing transformer terminals.\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 This transformer is designed for the Carrier \u003cstrong\u003eC4850C50ZN030500\u003c\/strong\u003e packaged unit. Verify your existing transformer's input\/output voltage and VA rating on the unit's data plate or existing component label before ordering. Need help confirming fitment? Our HVAC parts team is available to verify compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909776429427,"sku":"CARRIE-C4850C50ZN030500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909776462195,"sku":"CARRIE-C4850C50ZN030500-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_58c46381-d3d9-441f-bf8a-dca7d5831524.jpg?v=1782939059","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn030500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}