{"product_id":"carrier-c50a402551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A402551","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C50A402551\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C50A402551\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, nothing responds, and the system will not start in any mode. It is often the first component to check when a system shows zero control-side activity.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 120V primary \/ 24V secondary | Step-down control transformer | OEM part number HT01BD236 | Factory-matched output for Carrier low-voltage circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound to exact VA and voltage tolerances required by the Carrier C50A402551 control board. Generic transformers may deliver slightly off-voltage output under load, causing nuisance tripping, board resets, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning work. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wires before disconnecting and inspect for any short circuit that may have caused the original failure — replacing a transformer without clearing the fault will blow the new unit immediately.\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 as a direct OEM replacement for Carrier model \u003cstrong\u003eC50A402551\u003c\/strong\u003e packaged units. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. If you're unsure about fitment, our parts team will verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909689528691,"sku":"CARRIE-C50A402551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909689561459,"sku":"CARRIE-C50A402551-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_ce253562-6917-4c76-9e5e-a34a68b8dcd2.jpg?v=1782940489","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a402551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}