{"product_id":"carrier-c4850c50aw03551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW03551 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C50AW03551\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AW03551\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers every component in your control circuit — thermostat, contactor coil, control board, and zone valves. When the transformer fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and you may measure 0V on the secondary side with a multimeter. It is one of the most commonly overlooked root causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD236 | Factory-matched to Carrier C4850C50AW03551 control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and impedance specifications, ensuring stable 24V output under full control-circuit load. Generic transformers with undersized VA ratings can sag under load, causing intermittent lockouts and nuisance board faults that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts or spade connectors. Label primary and secondary wiring before disconnecting the old unit. Verify 24V output on secondary terminals before reassembling the control panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C50AW03551\u003c\/strong\u003e packaged unit. Always verify your unit's control voltage and VA requirements on the data plate or wiring diagram before ordering. If you have questions about fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909821124979,"sku":"CARRIE-C4850C50AW03551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909821157747,"sku":"CARRIE-C4850C50AW03551-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_26ba0959-a0a4-45d7-bee7-502cc6f67769.jpg?v=1782938905","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aw03551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}