{"product_id":"carrier-c4850c48zn030500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C48ZN030500 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C48ZN030500\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZN030500\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V needed to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the unit won't call for heating or cooling, and the system appears completely dead even with power present at the disconnect.\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-circuit voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight secondary voltage regulation under full VA load, protecting sensitive control boards and thermostats. Off-brand units often deliver inconsistent 24V output, causing erratic relay chatter, nuisance lockouts, or premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before disconnecting the old unit. Ensure the new transformer's VA rating meets or exceeds the original.\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 Designed for the Carrier \u003cstrong\u003eC4850C48ZN030500\u003c\/strong\u003e packaged unit. Always verify primary voltage, secondary voltage, and VA rating on your unit's data plate before ordering to ensure correct fitment. Our team is available to confirm compatibility before you buy — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909860708723,"sku":"CARRIE-C4850C48ZN030500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909860741491,"sku":"CARRIE-C4850C48ZN030500-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_9c17aeb2-8850-44d4-8075-c3411a3f7a1c.jpg?v=1782938811","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zn030500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}