{"product_id":"carrier-c4850c48zn055500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN055500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48ZN055500\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48ZN055500\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, and control board. When this component fails, the entire low-voltage control circuit goes dead — the thermostat loses power, the system stops responding to calls for heating or cooling, and no fault codes are generated because the board itself has no power. It is one of the most commonly overlooked root causes of a completely unresponsive system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched mounting footprint and terminal configuration for direct drop-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier are wound to exact VA and voltage tolerances, protecting sensitive control boards and communicating thermostats from voltage sag. Undersized or off-tolerance generic transformers can cause intermittent lockouts and shorten board life significantly.\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 starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Confirm 24V output at secondary terminals before reconnecting low-voltage wiring. Label all wires before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C48ZN055500\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm a match. Our parts specialists are available to verify fitment — contact us before you order if you have any questions. \u003cstrong\u003eOrder now and get same-day shipping on this in-stock OEM part.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909855990131,"sku":"CARRIE-C4850C48ZN055500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909856022899,"sku":"CARRIE-C4850C48ZN055500-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_319f8bb5-f8cc-4085-8046-fca1c79c619c.jpg?v=1782938829","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn055500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}