{"product_id":"carrier-c4850c48zg030900-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48ZG030900","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C48ZG030900\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-replacement control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48ZG030900\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC 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 will respond: the thermostat goes blank, the unit won't call for heating or cooling, and you may measure zero volts on the secondary terminals. It is one of the most overlooked yet critical components in the system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rating | OEM Part Number HT01BD236 | Factory-matched construction for Carrier packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact VA and voltage specifications required by Carrier. Generic transformers with undersized VA ratings can overheat, trip internal fuses, or cause erratic control behavior — OEM is the correct choice for reliable long-term operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Verify 0V on primary terminals before touching wiring. Label or photograph all wiring connections before removal.\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\u003eC4850C48ZG030900\u003c\/strong\u003e packaged unit. Verify input voltage and VA rating on your existing transformer's label before ordering to confirm fitment. If you're unsure, our HVAC parts specialists are available to verify compatibility before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909867327859,"sku":"CARRIE-C4850C48ZG030900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909867360627,"sku":"CARRIE-C4850C48ZG030900-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_352fe896-5d6e-458b-a905-77c6df032f0f.jpg?v=1782940080","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zg030900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}