{"product_id":"carrier-c4850c50ay04051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AY04051 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C50AY04051\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AY04051\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V control circuit voltage that powers your thermostat, contactor coil, gas valve, and control board. When this part fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and you may blow a 3A control fuse. It is one of the most commonly overlooked failure points during no-power diagnostics.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA output rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | OEM part number HT01BD236 | Direct factory-matched replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers like this HT01BD236 are wound to exact VA and impedance specs for the Carrier C4850C50AY04051 control circuit. Generic transformers can run hot, trip thermal cutoffs prematurely, or deliver unstable 24V output that causes nuisance lockouts and erratic board behavior.\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, needle-nose pliers, multimeter (verify 0V before touching terminals). Label or photograph all low-voltage wiring before disconnecting from terminal block. Verify fuse integrity before condemning the transformer.\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 Engineered specifically for the Carrier \u003cstrong\u003eC4850C50AY04051\u003c\/strong\u003e packaged unit. Cross-reference OEM part number HT01BD236 against your unit's data plate and wiring diagram before ordering. If you're unsure of fitment, our HVAC parts team is available to verify compatibility before your order is placed — ensuring you get the right part the first time. Order today and get same-day shipping on all in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909810508147,"sku":"CARRIE-C4850C50AY04051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909810540915,"sku":"CARRIE-C4850C50AY04051-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_7a6c5cf2-25bf-4dbf-bc91-3d8e09d709d6.jpg?v=1782938965","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay04051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}