{"product_id":"carrier-c4850c50zg030500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50ZG030500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C50ZG030500\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control circuit transformer for the \u003cstrong\u003eCarrier C4850C50ZG030500\u003c\/strong\u003e packaged unit, sold under OEM part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control system goes dark: the thermostat shows no response, the unit won't start, and you may measure 0V at the secondary terminals despite line voltage being present. A failed transformer is often caused by a shorted control wire or failed component elsewhere in the 24V circuit, so always inspect for downstream faults before replacing.\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 | Replaces factory-installed transformer on Carrier C4850C50ZG030500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-brand transformers can overheat and trip the built-in thermal fuse, leaving you chasing a second failure within weeks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label and photograph all wiring connections before removing the old unit. Check secondary voltage (24V) with power restored before reassembling the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50ZG030500\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order — call or chat today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909782557043,"sku":"CARRIE-C4850C50ZG030500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909782589811,"sku":"CARRIE-C4850C50ZG030500-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_6a6b441e-929f-4da8-8ed7-235c5f81e84c.jpg?v=1782899415","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zg030500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}