{"product_id":"carrier-c4850c50zg090610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50ZG090610 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C50ZG090610\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZG090610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, no heating or cooling calls are answered, and the system appears completely unresponsive at the stat. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing costlier components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 control circuit transformer | Direct OEM replacement for part number HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact Carrier factory specifications. Generic alternatives frequently use undersized VA ratings that cause nuisance tripping under normal load — especially when multiple 24V accessories (humidifiers, zone boards, UV lights) share the circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify with a non-contact voltage tester before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all wire connections before removing the old transformer. Total replacement time is typically 20–30 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50ZG090610\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909777150323,"sku":"CARRIE-C4850C50ZG090610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909777183091,"sku":"CARRIE-C4850C50ZG090610-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_56f7ce7c-38dd-49c2-bf94-1529a97bba49.jpg?v=1782899426","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zg090610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}