{"product_id":"carrier-c4850c50zn040900-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN040900 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50ZN040900\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZN040900\u003c\/strong\u003e packaged unit. The 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, nothing in the system responds: the thermostat goes dark, the unit won't call for heating or cooling, and no fault codes are displayed. It is often the first component to check when the system appears completely dead with no obvious cause.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched insulation class and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and thermal cutoff specifications. Generic transformers frequently underperform under sustained load, causing nuisance tripping, premature burnout, or insufficient voltage to reliably pull in contactors and gas valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Photograph all wire connections before removal and match wiring color-for-color on reinstall.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC4850C50ZN040900\u003c\/strong\u003e packaged unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on the data plate or original component label before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before every order — call or chat today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909774791027,"sku":"CARRIE-C4850C50ZN040900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909774823795,"sku":"CARRIE-C4850C50ZN040900-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_ee14992d-66f5-46cc-b9cb-4c878ca65b61.jpg?v=1782939064","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn040900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}