{"product_id":"carrier-c4850c50aj03051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AJ03051 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C50AJ03051\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ03051\u003c\/strong\u003e packaged unit. The control transformer converts 120V line voltage down to the 24V signal used by your thermostat, contactor coil, and control board. When it fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. OEM part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40VA rated | Factory-matched windings and insulation class | Matches original mounting footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer (HT01BD236) is wound to Carrier's exact VA rating and insulation spec. Undersized or off-brand transformers can overheat under normal control circuit load, tripping internal breakers or failing prematurely — especially in systems with multiple accessories drawing 24V power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and confirm with a multimeter before touching any wiring. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Photograph all wiring connections before removal. The transformer typically mounts to the control panel with two screws and connects via spade or screw terminals.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50AJ03051\u003c\/strong\u003e packaged unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating on the unit data plate or transformer label before ordering. If your system powers multiple 24V accessories (humidifiers, UV lights, zone boards), confirm total VA draw does not exceed 40VA. Our team is available to verify fitment before you order — don't guess on a control circuit component.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909843308915,"sku":"CARRIE-C4850C50AJ03051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909843341683,"sku":"CARRIE-C4850C50AJ03051-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_d72f9715-faf5-476d-a477-b7f536fd8301.jpg?v=1782938852","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj03051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}