{"product_id":"carrier-c4850c48zg040900-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C48ZG040900","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48ZG040900\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48ZG040900\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 component fails, the thermostat goes completely dark, the system stops responding to calls for heating or cooling, and nothing operates. It is often the first part to inspect when a system appears totally dead despite confirmed power at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched output tolerance for reliable control circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overheat, blow fuses repeatedly, or damage sensitive control boards — making OEM the only recommended choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and confirm zero voltage with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminals, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output with a meter after installation before restoring full power.\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 Designed for the Carrier \u003cstrong\u003eC4850C48ZG040900\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909865984371,"sku":"CARRIE-C4850C48ZG040900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909866017139,"sku":"CARRIE-C4850C48ZG040900-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_8789c00a-d5c6-4d38-83a6-59782a212f95.jpg?v=1782939283","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zg040900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}