{"product_id":"carrier-c4850c50aj05061-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AJ05061 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AJ05061\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C4850C50AJ05061\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, nothing in the system responds: the thermostat goes blank, the unit won't energize, and you may measure 0V on the 24V secondary terminals. A failed transformer is often caused by a short in the control wiring or a failed component drawing excess current.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the factory OEM transformer engineered specifically for the Carrier C4850C50AJ05061. Generic transformers may share a VA rating but often lack proper thermal cutoffs and impedance matching, risking repeat failure or downstream control board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdriver, multimeter, wire stripper. Always check for downstream shorts in control wiring before installing the new transformer to prevent immediate re-failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50AJ05061\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure of fitment or have a related model number, our HVAC parts specialists will confirm compatibility before your order ships — same-day on orders placed before 3PM.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909835936115,"sku":"CARRIE-C4850C50AJ05061-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909835968883,"sku":"CARRIE-C4850C50AJ05061-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_a2f47df8-8042-491d-9b33-86360b88eec4.jpg?v=1782899107","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj05061-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}