{"product_id":"carrier-c4850c50z3035500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z3035500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C50Z3035500\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z3035500\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and no fault codes appear because the control circuit has no power to report them.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 output | Direct OEM replacement for part number HT01BD236 | Includes mounting bracket compatible with factory configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA ratings and insulation class specs. Undersized or off-tolerance generic units can overheat under load, trip thermal cutoffs repeatedly, or deliver unstable 24V that causes erratic contactor and gas valve behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 24V output at secondary terminals before restoring full system power. Label all wiring before disconnecting the old unit.\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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C50Z3035500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltage on the data plate or component label before ordering. If your system is tripping the transformer's thermal overload repeatedly, inspect downstream wiring for shorts before installing a replacement. Need fitment help? Our HVAC parts specialists confirm compatibility before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909797007731,"sku":"CARRIE-C4850C50Z3035500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909797040499,"sku":"CARRIE-C4850C50Z3035500-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_34fc349b-82a9-4e4e-8c3f-d67d452e11ef.jpg?v=1782939016","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3035500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}