{"product_id":"carrier-c4850c50ak03651-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AK03651 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AK03651\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier C4850C50AK03651\u003c\/strong\u003e packaged gas\/electric system. The transformer steps down 120V line voltage to the 24V signal voltage that powers the control board, thermostat, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system stops responding to calls for heating or cooling, and no components energize. A failed transformer is often misdiagnosed as a bad control board or thermostat, making this an essential first diagnostic check.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BD236 | Factory-matched for Carrier C4850C50AK03651 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and insulated to Carrier's exact VA and thermal specifications. Generic transformers may be under-rated for VA load, leading to overheating, nuisance tripping, or premature failure under full control-circuit demand.\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, needle-nose pliers, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Total job time is typically 20–30 minutes for an experienced technician.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eC4850C50AK03651\u003c\/strong\u003e packaged unit. Verify your unit's control circuit voltage requirements on the data plate before ordering. If you are unsure of fitment or need help confirming the correct part, our HVAC parts specialists are available to verify compatibility before you buy. Order today and get same-day shipping on this in-stock OEM transformer.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909829710195,"sku":"CARRIE-C4850C50AK03651-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909829742963,"sku":"CARRIE-C4850C50AK03651-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_d198db6d-ef28-4417-930b-d06fbb7ae004.jpg?v=1782938872","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ak03651-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}