{"product_id":"carrier-c4850c50aw05151-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AW05151 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50AW05151\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier C4850C50AW05151\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead: your thermostat loses power, the unit stops responding to calls for heating or cooling, and no fault codes are generated because the board itself has no power. A failed transformer is often misdiagnosed as a thermostat or control board failure, making correct identification critical before replacing more expensive components.\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 C4850C50AW05151 packaged systems\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 specifications. Undersized or off-brand transformers can overheat under peak control-circuit load, causing nuisance lockouts or premature failure — especially in systems with zone boards or accessories drawing additional 24V current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm voltage is absent before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm primary voltage and verify 24V output after install), wire nuts or spade connectors. Always document existing wiring with photos before disconnecting terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered and factory-matched for the \u003cstrong\u003eCarrier C4850C50AW05151\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. If you're unsure of fit, our HVAC parts specialists confirm compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909815783795,"sku":"CARRIE-C4850C50AW05151-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909815816563,"sku":"CARRIE-C4850C50AW05151-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_af52a8c0-9b0f-4857-94d6-abe7b0c64c1b.jpg?v=1782938930","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aw05151-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}