{"product_id":"carrier-c4850c48zg030200-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48ZG030200","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48ZG030200\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZG030200\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system stops responding to calls for heating or cooling, and no fault codes are generated because the board itself has no power to report them.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Class 2 output | Compatible with single-stage and two-stage control circuits | Matches factory footprint and wire gauge for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit (HT01BD236) is wound to Carrier's exact VA tolerance, ensuring stable 24V output under full control-circuit load. Generic transformers frequently under-deliver VA capacity, causing nuisance lockouts and premature contactor coil burnout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wiring before disconnecting. Confirm primary and secondary terminal polarity before restoring power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3 PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC4850C48ZG030200\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering — substituting an undersized VA transformer can damage connected components. Our fitment team is available to confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909868310899,"sku":"CARRIE-C4850C48ZG030200-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909868343667,"sku":"CARRIE-C4850C48ZG030200-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_bf6be7b7-f7d3-41d0-9c2c-db8aa62adf5d.jpg?v=1782940077","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zg030200-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}