{"product_id":"carrier-c4850c50z2050500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50Z2050500 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50Z2050500\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50Z2050500\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to calls for heating or cooling, and no diagnostic codes will appear because the board itself has no power.\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 for Carrier packaged units | Includes mounting bracket configuration matched to original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA tolerances ensuring clean, stable 24V output. Undersized or off-tolerance generic transformers can cause nuisance lockouts, erratic thermostat behavior, and premature control board failure due to voltage sag under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wires before removal and confirm primary and secondary terminals match the original wiring diagram on the unit's access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships the same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C4850C50Z2050500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order today and get your system's control circuit restored fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909803364723,"sku":"CARRIE-C4850C50Z2050500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909803397491,"sku":"CARRIE-C4850C50Z2050500-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_bf0b3c99-1409-471c-ad2b-2612eaace642.jpg?v=1782939001","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z2050500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}