{"product_id":"carrier-c4850c50aj04051-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50AJ04051 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AJ04051\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ04051\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to 24V AC, powering the low-voltage control circuit that connects the thermostat, contactor coil, gas valve, and control board. When this component fails, the entire control circuit goes dead — the thermostat display may go blank, no heating or cooling calls are answered, and the system appears completely unresponsive despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 control circuit transformer | OEM part number HT01BD236 | Factory-matched to Carrier C4850C50AJ04051 electrical schematic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic substitutes often run undersized VA ratings, causing thermal overload trips and premature failure under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Label all low-voltage wires before disconnecting. Confirm fuse integrity on the secondary circuit before condemning the transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C4850C50AJ04051\u003c\/strong\u003e packaged unit. Cross-reference OEM part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e against your unit's wiring diagram and data plate to confirm 120V primary and 24V\/40VA secondary specifications before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909839901043,"sku":"CARRIE-C4850C50AJ04051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909839933811,"sku":"CARRIE-C4850C50AJ04051-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_5bc2cd64-0646-4f52-9368-a7d5feb96a96.jpg?v=1782899404","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj04051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}