{"product_id":"carrier-c4850c48ay05151-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48AY05151","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C48AY05151\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48AY05151\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the unit won't energize, and no heating or cooling cycle can begin. It is often the first component to check when a system is completely unresponsive despite power being confirmed at the disconnect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched for Carrier packaged unit series\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. Generic alternatives frequently run undersized VA ratings, causing premature overheating and nuisance tripping on the internal thermal fuse — shortening the life of downstream control components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and verify with a non-contact voltage tester before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal. Primary (120V) and secondary (24V) leads must be correctly identified and reconnected.\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 for the Carrier \u003cstrong\u003eC4850C48AY05151\u003c\/strong\u003e packaged unit. Verify your existing transformer's input voltage, output voltage, and VA rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — contact us with your model and serial number for a fast response.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909874864499,"sku":"CARRIE-C4850C48AY05151-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909874897267,"sku":"CARRIE-C4850C48AY05151-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_6e0bcf95-6e18-4de0-9b6c-579060bf7133.jpg?v=1782940063","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay05151-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}