{"product_id":"carrier-c4850c50ak02551-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V Control Transformer for C4850C50AK02551 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AK02551\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AK02551\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to the 24V signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When it fails, the system goes completely silent: the thermostat goes blank, no components respond, and no error codes appear because the control circuit itself has lost power. A failed transformer is often misdiagnosed as a thermostat or control board failure, making correct identification critical before replacing more expensive parts.\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 C4850C50AK02551 packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-spec generic transformers can overheat and fail prematurely — or worse, damage the control board by delivering unstable voltage under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire nuts or spade terminals. Label all wires before disconnecting the old unit and verify polarity on reinstall.\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 Designed and factory-matched for the \u003cstrong\u003eCarrier C4850C50AK02551\u003c\/strong\u003e packaged unit. Always verify your unit's data plate and existing transformer VA\/voltage ratings before ordering to ensure a correct fit. Our team is available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909833871731,"sku":"CARRIE-C4850C50AK02551-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909833904499,"sku":"CARRIE-C4850C50AK02551-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_63fe053b-090e-4c51-b797-02367ebe804f.jpg?v=1782938781","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ak02551-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}