{"product_id":"carrier-c4850c50zn040200-transformer-h302a1","title":"OEM Carrier 40VA 120\/240V to 24V Control Transformer for C4850C50ZN040200 — HT01BD236 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50ZN040200\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZN040200\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V or 240V) down to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — the thermostat becomes unresponsive, the system won't start, and no error codes will display because the board itself has no power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V\/240V | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched for Carrier C4850C50ZN040200 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and insulated to Carrier's exact specifications, ensuring stable 24V output under full control-circuit load. Generic transformers frequently underperform at rated VA, causing nuisance tripping of the internal fuse and intermittent control failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Verify 24V output at secondary terminals after installation. Label all low-voltage wiring before disconnecting and check for a shorted control wire that may have caused the original failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship 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\u003eC4850C50ZN040200\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary voltage on the unit data plate before ordering — substituting an undersized VA transformer will result in premature failure. If you have questions about fitment, our HVAC parts specialists confirm compatibility before your order ships.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909775380851,"sku":"CARRIE-C4850C50ZN040200-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909775413619,"sku":"CARRIE-C4850C50ZN040200-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.jpg?v=1782899074","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn040200-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}