{"product_id":"carrier-c4850c50zn035500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZN035500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50ZN035500\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C4850C50ZN035500\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage down to the 24V signal voltage that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and all safety switches. When this transformer fails, the entire system goes silent: no thermostat response, no blower activation, and no heating or cooling output whatsoever. It is often the first component to check when a unit appears completely unresponsive despite confirmed line voltage at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output voltage tolerance for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and rated to Carrier's exact VA and voltage specifications. Generic transformers frequently run undersized VA ratings, causing premature thermal cutout trips and intermittent control failures under full-load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Always verify 0V at the primary terminals before handling. Photograph existing wiring before disconnecting leads. Torque wire nuts firmly to prevent arcing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50ZN035500\u003c\/strong\u003e packaged unit. Confirm your unit's data plate lists a 40VA 120V\/24V transformer before ordering. If your existing transformer shows signs of overheating, discoloration, or a tripped internal fuse, a shorted secondary load may be present — inspect downstream wiring before installing the replacement. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out via chat or phone.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909775839603,"sku":"CARRIE-C4850C50ZN035500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909775872371,"sku":"CARRIE-C4850C50ZN035500-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_74571da9-c41d-40a1-9d22-da4fb0d237a2.jpg?v=1782899232","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn035500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}