{"product_id":"carrier-fa4cnc030008aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FA4CNC030008AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V–24V for Model FA4CNC030008AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FA4CNC030008AAAA\u003c\/strong\u003e air handler. The transformer steps down line voltage (120V) to the 24V AC control circuit voltage that powers your thermostat, contactor coil, and control board. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to calls for heating or cooling, and no safety circuits can operate. It's one of the most overlooked but critical components in any air handler.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V AC secondary output | Mounts directly to factory bracket | OEM part number HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM Carrier transformer is wound to exact factory VA and voltage specifications. Undersized generic transformers can overheat under full control-circuit load — especially when multiple accessories (humidifiers, UV lights, zoning boards) share the 24V circuit — leading to premature failure or nuisance tripped fuses.\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 beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph existing wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFA4CNC030008AAAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and voltage markings on the unit data plate before ordering to ensure an exact match. If your system has added accessories drawing 24V power, confirm total VA load does not exceed 40VA. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909550428531,"sku":"CARRIE-FA4CNC030008AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909550461299,"sku":"CARRIE-FA4CNC030008AAAA-TRANSFORMER-HT01CN241-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-HT01CN241_54429c21-3d64-42e3-b859-82102eeeaafa.jpg?v=1782939477","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4cnc030008aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}