{"product_id":"carrier-c4850c50ak04161-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V Control Transformer for C4850C50AK04161 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AK04161\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AK04161\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no sequencing can occur. A failed transformer is often misdiagnosed as a board or thermostat failure, 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 | Secondary: 24V | OEM part number HT01BD236 | Designed to factory tolerance for Carrier packaged equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and insulated to Carrier's exact specifications, ensuring stable 24V output under full load. Generic alternatives frequently deliver fluctuating voltage that causes nuisance lockouts, contactor chatter, and premature control board failure.\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 proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections (R, C, G, Y, W) before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003eC4850C50AK04161\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists confirm compatibility before your order is placed — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909827055987,"sku":"CARRIE-C4850C50AK04161-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909827088755,"sku":"CARRIE-C4850C50AK04161-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_f5fc2eea-c50c-40a8-885a-97a4faa845da.jpg?v=1782938787","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ak04161-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}