{"product_id":"carrier-c4850c50aw03661-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03661 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model C4850C50AW03661\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AW03661\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by the control board, thermostat, and all low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — the thermostat becomes unresponsive, the system won't call for heating or cooling, and no diagnostic codes will display. It is often the first component to check when nothing works but the disconnect is confirmed live.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01BD236 | Factory-matched to Carrier C4850C50AW03661 electrical specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring reliable 24V output under full control-circuit load. Undersized generic transformers can sag voltage under load, causing erratic board behavior and nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Confirm primary and secondary wiring polarity before energizing. Photograph existing wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and verified for Carrier model \u003cstrong\u003eC4850C50AW03661\u003c\/strong\u003e packaged units. Always confirm your existing transformer's VA rating and voltage markings on the unit data plate before ordering to ensure an exact match. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out before purchasing.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909819486579,"sku":"CARRIE-C4850C50AW03661-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909819519347,"sku":"CARRIE-C4850C50AW03661-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_ee33439b-f5cb-46ad-8f1a-b0373c930d44.jpg?v=1782938912","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aw03661-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}