{"product_id":"carrier-c4850c50zn050500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN050500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C50ZN050500\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZN050500\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V low-voltage signal required by the control board, thermostat, contactor coil, and all safety circuit components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may measure zero voltage at the secondary terminals. It is often misdiagnosed as a control board failure, making it one of the most important first checks during a no-power service call.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120VAC | Output 24VAC | 40VA rating | OEM part number HT01BD236 | Color-coded wire leads for fast reconnection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier are wound to precise VA tolerances, protecting downstream low-voltage components from brownout or surge conditions. Generic units often underperform at rated VA, causing nuisance control board resets or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching wiring), wire nuts or spade connectors. Photograph existing wiring before removal. Secondary fuse replacement recommended if original transformer was shorted.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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\u003eC4850C50ZN050500\u003c\/strong\u003e packaged unit. Confirm your existing transformer's input\/output voltage and VA rating on the data plate or original component label before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909773971827,"sku":"CARRIE-C4850C50ZN050500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909774004595,"sku":"CARRIE-C4850C50ZN050500-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_d0403b8c-fbc4-4c67-9f5b-6d3ab4190bb5.jpg?v=1782939069","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn050500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}