{"product_id":"carrier-c4850c48zn030200-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN030200 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48ZN030200\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified 120V-to-24V step-down transformer for the \u003cstrong\u003eCarrier C4850C48ZN030200\u003c\/strong\u003e packaged unit. The transformer powers the entire 24V control circuit — including the thermostat, contactor coil, and control board. When it fails, absolutely nothing responds: the thermostat goes dark, the system won't call for heating or cooling, and the unit sits completely unresponsive despite power being present at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD236 | Factory-matched construction for Carrier C4850C48ZN030200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact VA and insulation class specifications. Generic transformers often underrate their VA capacity, causing premature thermal cutout trips and nuisance lockouts — especially under high-demand control circuit loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the unit disconnect and verify zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label all wiring connections before removal. Primary wires connect to line voltage; secondary wires feed the 24V control circuit — do not reverse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship 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 C4850C48ZN030200\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you buy if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909860774259,"sku":"CARRIE-C4850C48ZN030200-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909860807027,"sku":"CARRIE-C4850C48ZN030200-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_7b2b7cb2-361c-40ca-ad7f-c720f4e57eeb.jpg?v=1782938809","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn030200-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}