{"product_id":"carrier-c4850c50zn055900-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZN055900 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50ZN055900\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZN055900\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 safety circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and no heating or cooling cycle can initiate. It is one of the first components to check when a unit shows zero control response with line voltage confirmed at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Class 2 rated | Direct OEM replacement for part number HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generics can cause nuisance tripping of the secondary fuse or premature control board damage under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the unit disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter to confirm 24V output after install. Photograph all wiring before disconnecting. Swap is straightforward for any DIY-competent homeowner or technician.\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 specifically for the Carrier \u003cstrong\u003eC4850C50ZN055900\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) on your unit's data plate before ordering. If your unit runs a 208\/240V primary, do not install this transformer. Our fitment team is available to confirm compatibility before you order — reach out before purchasing if unsure.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909771874675,"sku":"CARRIE-C4850C50ZN055900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909771907443,"sku":"CARRIE-C4850C50ZN055900-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_82bc952a-3dd0-4487-a9a7-08960709ab60.jpg?v=1782899241","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn055900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}