{"product_id":"carrier-c4850c50zz105610-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZZ105610 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50ZZ105610\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZZ105610\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, gas valve, and control board. When this transformer fails, absolutely nothing in the system responds: the thermostat goes blank, the unit won't energize, and the system appears completely dead. A failed transformer is often misdiagnosed as a control board failure, making correct identification critical before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Step-down control transformer | OEM part number HT01BD236 | Factory-matched to Carrier C4850C50ZZ105610 electrical specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control circuit. Undersized or off-tolerance generic transformers can overload, trip internal fuses, or damage sensitive control boards — making OEM the only reliable choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output after install). Label all wires before disconnecting. Test secondary voltage output before closing the unit.\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 climate-controlled HVAC parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C50ZZ105610\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. If your thermostat is completely unresponsive and your disconnect and breakers are confirmed good, this transformer is the first component to test with a multimeter. Our parts specialists are available to confirm fitment before you order — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909764469107,"sku":"CARRIE-C4850C50ZZ105610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909764501875,"sku":"CARRIE-C4850C50ZZ105610-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_1adb8398-9660-42d6-96b2-683f4348d197.jpg?v=1782939101","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zz105610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}