{"product_id":"carrier-c4850c48z8075610-transformer-h302a1","title":"OEM Carrier 40VA Transformer 120V-24V HT01BD236 — C4850C48Z8075610","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48Z8075610\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48Z8075610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, the entire system goes silent: the thermostat goes blank, no calls for heating or cooling are processed, and nothing responds. A failed transformer is one of the most common root causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched insulation class and terminal configuration for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation specifications. Undersized or off-brand transformers can overload under peak demand — especially when multiple accessories draw current simultaneously — leading to premature failure and potential control board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always label or photograph existing wiring before disconnecting terminals.\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 for use in the \u003cstrong\u003eCarrier C4850C48Z8075610\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltage on the unit's data plate or wiring schematic before ordering. Our fitment team is available to confirm compatibility before you buy — just reach out with your model and serial number.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909869261171,"sku":"CARRIE-C4850C48Z8075610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909869293939,"sku":"CARRIE-C4850C48Z8075610-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_74109ea9-0230-4b3c-b6be-f6183c419502.jpg?v=1782899675","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48z8075610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}