{"product_id":"carrier-c4850c50z2105610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z2105610 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50Z2105610\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50Z2105610\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control system goes dark: the thermostat displays nothing, the system won't respond to any call for heating or cooling, and no diagnostic codes are generated because there is no power to the board. A failed transformer is often mistaken for a thermostat or control board failure, so always confirm 24V output at secondary terminals before replacing other components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part HT01BD236 | Factory-matched output tolerance for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight output voltage regulation under varying load conditions. Generic units can sag below 24V under full control load, causing erratic contactor chatter, false lockouts, and premature board failures.\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 touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before removal. Test 24V output at secondary terminals after installation before reassembling panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and tested specifically for the \u003cstrong\u003eCarrier C4850C50Z2105610\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or the transformer label before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909799727475,"sku":"CARRIE-C4850C50Z2105610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909799760243,"sku":"CARRIE-C4850C50Z2105610-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_bd41105c-43e8-41a0-b851-e9d342f001a0.jpg?v=1782899169","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z2105610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}