{"product_id":"carrier-c4850c48zn050500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZN050500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C48ZN050500\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZN050500\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to the 24V signal voltage that powers your thermostat, contactor coil, and all control board logic. When it fails, the entire control circuit goes dead — the thermostat goes blank, the unit won't respond to any calls for heating or cooling, and no fault codes are generated because the board itself has no power. A failed transformer is often misdiagnosed as a control board failure, so always verify 24V output at the transformer secondary before replacing more expensive 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 | Direct factory replacement with matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers include factory-matched VA ratings and built-in thermal protection fuses. Generic units frequently lack proper overload protection, risking secondary failures and possible board damage during a short circuit event.\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 wiring before disconnecting and confirm primary\/secondary terminals against the wiring diagram on the unit door.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty included. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C48ZN050500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our fitment team is available to confirm compatibility before you buy — don't guess on a control circuit component. Order today and get same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909857366387,"sku":"CARRIE-C4850C48ZN050500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909857399155,"sku":"CARRIE-C4850C48ZN050500-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_5d381e31-b04d-4921-b85f-f68ed2d9f89a.jpg?v=1782899087","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn050500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}