{"product_id":"carrier-c50a403561-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C50A403561","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C50A403561\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C50A403561\u003c\/strong\u003e commercial rooftop unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coils, and all safety controls. When it fails, the entire control circuit goes dead: the thermostat displays nothing, relays won't energize, and the unit refuses to start regardless of demand. A failed transformer is often misdiagnosed as a board failure, 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 | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output tolerance for reliable low-voltage circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers include factory-correct VA rating and winding insulation class. Undersized or generic transformers can overheat under full control-circuit load, tripping thermal cutoffs and causing intermittent no-start conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Photograph all wiring connections before removal. Verify 120V at primary terminals and 24V at secondary terminals after installation to confirm correct operation.\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 Designed for the Carrier \u003cstrong\u003eC50A403561\u003c\/strong\u003e commercial rooftop unit. Confirm primary voltage (120V) and VA rating on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you place your order — contact us anytime.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909683270003,"sku":"CARRIE-C50A403561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909683302771,"sku":"CARRIE-C50A403561-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_21232540-1c49-49a9-a8ed-639b21fb41e6.jpg?v=1782939369","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a403561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}