{"product_id":"carrier-fa4cnc018008aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FA4CNC018008AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC018008AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FA4CNC018008AAAA\u003c\/strong\u003e air handler. The transformer steps down line voltage from 120V to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, absolutely nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and no blower or fan operation occurs. A failed transformer is often mistaken for a bad thermostat or control board, making it one of the most commonly misdiagnosed components in the system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN241 | Factory-matched to FA4CNC018008AAAA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact factory specifications. Generic alternatives often use thinner windings and lower-grade cores, increasing the risk of overheating, voltage sag under load, and premature failure — especially when multiple accessories share the 24V circuit.\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 stripper, multimeter. Label all wiring connections before removal. Verify 24V output with a multimeter after installation and before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed by 3 PM local time ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier FA4CNC018008AAAA\u003c\/strong\u003e air handler. If your unit's data plate confirms a 40VA 120V\/24V transformer requirement and OEM part number HT01CN241, this is a direct drop-in replacement. Have your model and serial number ready when ordering — our fitment team is available to confirm compatibility before you buy. \u003cstrong\u003eIn stock and ships today.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909552427379,"sku":"CARRIE-FA4CNC018008AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909552460147,"sku":"CARRIE-FA4CNC018008AAAA-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_f8cdd11e-f0a5-444d-a320-dac964cdc6bb.jpg?v=1782939471","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4cnc018008aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}