{"product_id":"carrier-c4850c48ay05161-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48AY05161","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C48AY05161\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48AY05161\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the system becomes completely unresponsive: the thermostat goes blank, the contactor won't pull in, and no heating or cooling function is possible. A blown transformer is often caused by a short in the 24V control wiring, so inspect all low-voltage wiring before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120VAC | Output 24VAC | 40VA rating | OEM part number HT01BD236 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound and rated to exact factory specifications. Generic transformers often use lighter gauge windings and lack integrated thermal cutoffs, making them prone to early failure — especially under high-demand control circuit loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after install. Always check for low-voltage short circuits before energizing the new transformer.\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 as a direct OEM replacement for the \u003cstrong\u003eCarrier C4850C48AY05161\u003c\/strong\u003e packaged unit. Verify your existing transformer's input\/output voltage and VA rating on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909874110835,"sku":"CARRIE-C4850C48AY05161-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909874143603,"sku":"CARRIE-C4850C48AY05161-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_2fff987d-f845-44ed-9871-28596313d116.jpg?v=1782940065","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay05161-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}