{"product_id":"carrier-c4850c50ay03051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AY03051 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AY03051\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AY03051\u003c\/strong\u003e packaged unit. The transformer steps down 120V primary voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, the system goes completely unresponsive: the thermostat goes blank, no heating or cooling stages engage, and the unit will not respond to any call for conditioning. A failed transformer is one of the most common causes of a completely dead HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched windings and core for full compatibility with Carrier C4850C50AY03051 control circuitry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances, protecting sensitive control boards from under- or over-voltage. Generic units often lack proper overcurrent protection, risking board damage on a fault condition.\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, wire stripper, multimeter. Verify 24V output after installation before closing the panel. Always check for a shorted control wire that may have caused the original transformer failure — replacing the transformer without clearing the short will blow the new unit immediately.\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 specifically for the Carrier \u003cstrong\u003eC4850C50AY03051\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If you're unsure of fitment, our HVAC parts team will verify compatibility before your order ships — same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909812179315,"sku":"CARRIE-C4850C50AY03051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909812212083,"sku":"CARRIE-C4850C50AY03051-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_bafb3c76-6462-4c7d-bd0f-9bc64725de17.jpg?v=1782938950","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay03051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}