{"product_id":"carrier-c4850c50ay04161-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AY04161 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AY04161\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AY04161\u003c\/strong\u003e packaged unit. The transformer steps down incoming 120V line voltage to the 24V AC signal required to power your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no contactors or gas valves will energize. It is one of the first components to check when a unit shows zero low-voltage activity.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01BD236 | Direct factory-matched replacement for Carrier C4850C50AY04161\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can overheat under simultaneous thermostat and accessory loads, blowing the secondary fuse or damaging the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 24V output at secondary terminals after installation before restoring full power. Always photograph existing wiring before disconnecting leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the Carrier \u003cstrong\u003eC4850C50AY04161\u003c\/strong\u003e packaged unit. Confirm your unit's data plate shows 120V primary control voltage and a 40VA transformer requirement before ordering. Our parts specialists are available to verify fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909809099123,"sku":"CARRIE-C4850C50AY04161-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909809131891,"sku":"CARRIE-C4850C50AY04161-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_1a5ede55-96a3-47f3-a233-62798ce999d8.jpg?v=1782938968","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay04161-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}