{"product_id":"carrier-c4850c48ay04061-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48AY04061","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C48AY04061\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48AY04061\u003c\/strong\u003e packaged unit. The transformer steps high-voltage line power (120V) down to the 24V signal voltage required by the thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat loses communication, the unit won't respond to any call for heating or cooling, and nothing powers on despite the disconnect being live. A blown transformer is often the first sign of a shorted low-voltage wire or a faulty component drawing excessive current downstream.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V secondary output | Factory-matched OEM configuration | Compact chassis for direct drop-in fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound and rated to Carrier's exact specifications, ensuring proper VA capacity and thermal protection. Generic alternatives frequently carry lower actual VA ratings despite printed labels, leading to premature thermal cutout or nuisance tripping under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before servicing. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires prior to removal. Verify 24V output at secondary terminals after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eC4850C48AY04061\u003c\/strong\u003e packaged unit. Always confirm your unit's control circuit voltage requirements and VA rating on the data plate or wiring diagram before ordering. If your low-voltage fuse is blowing repeatedly, diagnose and correct the downstream fault before installing the new transformer. Our parts specialists are available to verify fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909880467827,"sku":"CARRIE-C4850C48AY04061-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909880500595,"sku":"CARRIE-C4850C48AY04061-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_1f6df288-a516-4993-8ce6-9e34b2e761f9.jpg?v=1782940055","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48ay04061-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}