{"product_id":"carrier-c4850c50z7090610-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z7090610 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model C4850C50Z7090610\u003c\/h1\u003e\u003cp\u003eThis is the factory-original replacement transformer (OEM part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50Z7090610\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V control circuit voltage that powers your thermostat, contactor coil, and all low-voltage switching. When this component fails, the entire control circuit goes dark — you'll see a blank thermostat display, no response to any call for heating or cooling, and potentially a tripped secondary fuse. It is often the first part to diagnose when absolutely nothing in the system responds.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Direct drop-in replacement, no wiring modification required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage specifications. Generic transformers are frequently under-rated in VA output, causing premature overheating and failure when paired with modern multi-stage controls and zone boards that draw higher sustained current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Photograph existing wiring before disconnecting. Secondary circuit fuse should also be inspected and replaced if blown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer 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 Engineered specifically for the Carrier \u003cstrong\u003eC4850C50Z7090610\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. If you are unsure of fitment, our parts team will confirm compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909785735539,"sku":"CARRIE-C4850C50Z7090610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909785768307,"sku":"CARRIE-C4850C50Z7090610-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_e5670631-2345-4aab-9095-4fedb72147da.jpg?v=1782939036","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z7090610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}