{"product_id":"carrier-c4850c48zn055900-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN055900 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C48ZN055900\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48ZN055900\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, nothing in your system responds: the thermostat goes blank, the unit won't energize, and you may measure zero volts at the secondary terminals. It is one of the first components to check when a unit is completely unresponsive despite confirmed line voltage at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120VAC | Output 24VAC | 40VA rated | OEM part number HT01BD236 | Factory-matched for Carrier C4850C48ZN055900 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to Carrier's exact VA specification. Generic transformers frequently run under-rated VA, causing overheating and nuisance tripping of the internal thermal fuse — a failure mode that restores temporarily and confuses diagnosis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Confirm primary and secondary wiring labels before disconnecting. Always verify 24V output at secondary terminals after installation before closing the access panel.\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 Direct OEM replacement for Carrier model \u003cstrong\u003eC4850C48ZN055900\u003c\/strong\u003e packaged units. Verify input voltage and VA rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909853892979,"sku":"CARRIE-C4850C48ZN055900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909853925747,"sku":"CARRIE-C4850C48ZN055900-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_bd03efa1-1964-49f8-9c8d-24686c46cac2.jpg?v=1782938834","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn055900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}