{"product_id":"carrier-c50a403551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A403551","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C50A403551 — Part# HT01BD236\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A403551\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal required by the thermostat, contactor coils, and all low-voltage control components. When this part fails, the entire control circuit loses power — the thermostat goes blank, the system does not respond to any calls for heating or cooling, and no fault codes are generated because the board itself has no power. 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 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched impedance and thermal overload protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact Carrier factory specifications, ensuring precise 24V output under full VA load. Generic transformers frequently underperform at rated VA, causing nuisance tripping of downstream controls and premature contactor coil burnout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Photograph existing wiring connections before removal. Test output voltage after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A403551\u003c\/strong\u003e commercial rooftop\/packaged unit. Always verify primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required. \u003cstrong\u003eOrder now and your part ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909683663219,"sku":"CARRIE-C50A403551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909683695987,"sku":"CARRIE-C50A403551-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_8b05da29-72ff-436d-aeab-fcf66994d33b.jpg?v=1782940517","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a403551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}