{"product_id":"carrier-c4850c50z2070200-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z2070200 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C50Z2070200\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50Z2070200\u003c\/strong\u003e packaged unit. The control transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the system goes completely silent: no thermostat response, no contactor click, and no ignition sequence. A shorted transformer will often blow the 3A or 5A control fuse as well, so always inspect the fuse before condemning the board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 control transformer | OEM part number HT01BD236 | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and insulated to Carrier's exact factory specifications. Aftermarket transformers often ship with undersized VA ratings that sag under full control-circuit load, causing erratic thermostat behavior and premature contactor coil failure.\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, wire nuts or spade connectors, multimeter to verify 24V output after installation. Label and photograph all wire connections before removing the original unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C50Z2070200\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909800808819,"sku":"CARRIE-C4850C50Z2070200-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909800841587,"sku":"CARRIE-C4850C50Z2070200-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_e3e5d980-c358-439b-97e7-1fdb74223d09.jpg?v=1782899157","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z2070200-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}