{"product_id":"carrier-c50a404051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C50A404051","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C50A404051\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A404051\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V line voltage to the 24V required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — your thermostat loses power, the system won't respond to calls for heating or cooling, and no fault codes can even be generated. A failed transformer is often misdiagnosed as a bad thermostat or control board, so always verify 24V output at the secondary terminals before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Compatible with standard 24V control wiring configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and encapsulated to Carrier's exact VA and thermal specifications. Generic units often underrate VA capacity, causing thermal cutout trips under normal load — especially on systems with multiple 24V accessories or zone controllers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify 120V input is present before condemning the transformer. Test 24V secondary output after install to confirm proper operation.\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\u003eC50A404051\u003c\/strong\u003e commercial packaged rooftop unit. Verify primary voltage (120V) and VA rating on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy — call or chat today and we'll get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909682516339,"sku":"CARRIE-C50A404051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909682549107,"sku":"CARRIE-C50A404051-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_5f794069-733a-4000-9417-28ad61fab8f5.jpg?v=1782939374","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a404051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}