{"product_id":"carrier-c4850c50aj02561-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C50AJ02561","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50AJ02561\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (Part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ02561\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system will not respond to any call for heating or cooling, and nothing turns on. It is one of the first components to check when a unit shows zero response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM Part# HT01BD236 | Factory-matched for Carrier C4850C50AJ02561 packaged systems\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 voltage output and VA capacity. Generic transformers may underperform under full control circuit load, causing nuisance lockouts or premature failure of downstream components like the contactor coil or gas valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or quick-connects. Always label or photograph existing wiring before disconnecting. Confirm blown fuse or tripped secondary fuse before condemning the transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. 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 specifically for the Carrier \u003cstrong\u003eC4850C50AJ02561\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. If your secondary fuse repeatedly blows after replacement, inspect downstream components for shorts before reinstalling. Our HVAC parts specialists are available to confirm fitment — order with confidence and get your system back online today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909845143923,"sku":"CARRIE-C4850C50AJ02561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909845176691,"sku":"CARRIE-C4850C50AJ02561-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_79e7192a-7765-4e74-b5a0-744945b972e2.jpg?v=1782940119","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj02561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}