{"product_id":"carrier-c4850c48zn035600-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN035600 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C48ZN035600\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C4850C48ZN035600\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage down to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, absolutely nothing in the control circuit responds: the thermostat goes blank, the system won't call for heating or cooling, and the unit sits completely unresponsive despite power being present at the unit.\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 output tolerance for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight output voltage regulation under load, protecting sensitive control boards and thermostats from voltage fluctuations that generic units often produce. Using the correct OEM part prevents nuisance lockouts and premature board failures.\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, needle-nose pliers, multimeter to verify 24V output after installation. Photograph all low-voltage wiring connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C48ZN035600\u003c\/strong\u003e packaged unit. Verify the OEM part number HT01BD236 against your unit's data plate or existing transformer label before ordering. If you're unsure about fitment, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909858906483,"sku":"CARRIE-C4850C48ZN035600-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909858939251,"sku":"CARRIE-C4850C48ZN035600-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_ebf86765-d8be-48c0-b0b7-ef3dc1a18fc9.jpg?v=1782938816","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn035600-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}