{"product_id":"carrier-c4850c50ak02051-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AK02051 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AK02051\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AK02051\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all safety circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any commands, and no heating or cooling function is possible. A blown fuse on the secondary side is a common symptom; always check for downstream short circuits before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output for Carrier control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to exact factory VA tolerances, ensuring stable 24V output under full control circuit load. Generic replacements can sag under load voltage, causing intermittent lockouts, nuisance trips, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 0V at primary leads before touching wiring. Photograph existing wire connections before disconnecting the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50AK02051\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If you're unsure of fitment or have questions about your specific configuration, our HVAC parts specialists verify compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909834494323,"sku":"CARRIE-C4850C50AK02051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909834527091,"sku":"CARRIE-C4850C50AK02051-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_5ec6d42e-d547-49aa-a858-65a058a8e447.jpg?v=1782899116","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ak02051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}