{"product_id":"carrier-c4850c50z3030900-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50Z3030900 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model C4850C50Z3030900\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified step-down transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50Z3030900\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage safety and switching circuits. When this transformer fails, the entire control circuit loses power — the thermostat goes blank, the system becomes completely unresponsive, and no heating or cooling function can be initiated. It is one of the first components to check during a no-power diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated output | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BD236 | Factory-matched for Carrier packaged unit applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact VA and voltage tolerances specified by Carrier engineering. Generic transformers frequently underperform on VA output, causing nuisance tripping of the control board fuse and premature failure of downstream low-voltage components.\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, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting the old transformer. Verify 24VAC output with a multimeter after installation before closing the cabinet.\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 as a direct OEM replacement for \u003cstrong\u003eCarrier model C4850C50Z3030900\u003c\/strong\u003e packaged units. Cross-reference part number HT01BD236 against your unit's data plate or wiring diagram to confirm fitment before ordering. Not sure it fits? Our HVAC parts specialists verify compatibility before you buy — reach out and we'll confirm within minutes.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909797564787,"sku":"CARRIE-C4850C50Z3030900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909797597555,"sku":"CARRIE-C4850C50Z3030900-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_7e540b60-651a-42e3-a8e8-524ba1321ba9.jpg?v=1782899411","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3030900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}