{"product_id":"carrier-c4850c48ay04151-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48AY04151","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48AY04151\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48AY04151\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V signal used by your thermostat, contactor coil, and control board. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for cooling or heating, and no safety or staging functions operate. If your system has power at the disconnect but nothing responds at the stat, a failed transformer is one of the first components to test.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | Primary: 120V | Secondary: 24V | Class 2 insulation | Direct OEM replacement for part# HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA ratings and insulation class, ensuring reliable 24V output under full control-circuit load. Generic units can sag under load, causing nuisance lockouts and intermittent faults that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Confirm 24V output at secondary terminals after installation before restoring the control circuit. Always photograph or label existing wiring before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3 PM ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for the Carrier \u003cstrong\u003eC4850C48AY04151\u003c\/strong\u003e packaged unit. Verify primary voltage on your unit's data plate before ordering — some installations may use 208\/240V primary transformers that require a different part number. Our HVAC parts specialists are available to confirm fitment before you order. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909877879155,"sku":"CARRIE-C4850C48AY04151-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909877911923,"sku":"CARRIE-C4850C48AY04151-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_66d33ef3-280b-4da0-84b3-5ebc93f967c9.jpg?v=1782940057","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay04151-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}