{"product_id":"carrier-c4850c50z3030200-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z3030200 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50Z3030200\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z3030200\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V control circuit voltage that powers your thermostat, contactor coil, gas valve, and all low-voltage safety controls. When the transformer fails, nothing in the control circuit responds — the system will appear completely dead, with no response from the thermostat, no contactor engagement, and no ignition sequence initiated.\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 insulation class and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance specs for this unit. Undersized or off-tolerance generic units can overheat under normal control circuit loads, tripping internal thermal fuses and causing intermittent lockouts — often misdiagnosed as board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter, wire nuts or spade terminals, flathead and Phillips screwdrivers. Verify 120V primary and 24V secondary output with a meter before reconnecting the control circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for the \u003cstrong\u003eCarrier C4850C50Z3030200\u003c\/strong\u003e packaged unit. Confirm transformer VA rating and primary\/secondary voltages against your unit's data plate before ordering. Not sure it fits? Our HVAC parts team verifies fitment before you buy — order with confidence and get it shipped today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909799072115,"sku":"CARRIE-C4850C50Z3030200-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909799104883,"sku":"CARRIE-C4850C50Z3030200-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_860740e0-b5c7-49bf-ae08-1877774746bf.jpg?v=1782899171","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3030200-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}