{"product_id":"carrier-c4850c50aj05151-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AJ05151 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AJ05151\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ05151\u003c\/strong\u003e packaged unit. The transformer converts 120V primary power to the 24V AC signal that powers your entire control circuit — including the thermostat, contactor coil, gas valve, and safety switches. When it fails, the result is total control loss: the thermostat goes dark, the system won't respond to any call for heating or cooling, and no components energize. A failed transformer is often misdiagnosed as a bad thermostat or control board, so always verify 24V output at the secondary terminals before replacing other parts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and core material for correct inrush current handling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, trip the internal fuse repeatedly, or deliver insufficient voltage under load — causing intermittent lockouts and nuisance service calls.\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 touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Label all wires before disconnecting. Confirm 24V output on the secondary after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier C4850C50AJ05151\u003c\/strong\u003e packaged unit. Always verify your unit's data plate voltage requirements match 120V\/24V 40VA before ordering. Our fitment specialists are available to confirm compatibility before you purchase — no guesswork, no return shipping hassle.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909835247987,"sku":"CARRIE-C4850C50AJ05151-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909835280755,"sku":"CARRIE-C4850C50AJ05151-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_472aa84f-2cfd-4beb-9902-a73285289ad3.jpg?v=1782899110","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj05151-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}