{"product_id":"carrier-c4850c50zg040500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer HT01BD236 for C4850C50ZG040500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50ZG040500\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZG040500\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, absolutely nothing responds — the thermostat goes blank, the system won't call for heating or cooling, and no safety lockouts will trigger. If you've already verified your thermostat and control board are intact, a failed transformer is the next most likely culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM part HT01BD236 | Direct drop-in replacement with matching mounting footprint and wire lead configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA rating and insulation class for your unit. Undersized or off-brand transformers can overheat under peak load, blow fuses, or damage sensitive control boards — false economy on a part this critical.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label or photograph all low-voltage wiring before disconnecting. Confirm 24V output with a multimeter after installation and before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC4850C50ZG040500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or original part before ordering. If you're unsure of fitment, our parts team confirms compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909780787571,"sku":"CARRIE-C4850C50ZG040500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909780820339,"sku":"CARRIE-C4850C50ZG040500-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_644ca7cb-28b6-4e70-b7ee-644de5d438cc.jpg?v=1782899374","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zg040500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}