{"product_id":"carrier-c4850c50z3050500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C50Z3050500","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50Z3050500\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 C4850C50Z3050500\u003c\/strong\u003e packaged unit. It converts 120V line voltage to the 24V AC signal required to power the entire 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 no safety safeties can trip. It is often the first component to check when a system is completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output tolerance for reliable 24V control signal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier maintain precise 24V output under full VA load, protecting sensitive control boards and gas valves from voltage fluctuations. Generic units often sag under load, causing erratic thermostat behavior or nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire stripper. Photograph all wiring connections before removal. Reconnect primary (120V) leads last.\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 Engineered specifically for the \u003cstrong\u003eCarrier C4850C50Z3050500\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering to ensure a drop-in fit. Our parts specialists are available to verify fitment — reach out before you order if you have any questions. Order today and get same-day shipping!\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909795402099,"sku":"CARRIE-C4850C50Z3050500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909795434867,"sku":"CARRIE-C4850C50Z3050500-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_b36f8c56-8cb0-486b-bbe9-7dc660488310.jpg?v=1782940127","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3050500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}