{"product_id":"carrier-fb4cnf030l08acaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FB4CNF030L08ACAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FB4CNF030L08ACAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FB4CNF030L08ACAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control system goes dark: the thermostat becomes unresponsive, the system won't call for cooling or heating, and a multimeter will show 0V on the 24V secondary terminals.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 120V primary \/ 24V secondary | OEM part number HT01CN241 | Factory-matched output tolerances for stable control-circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight voltage regulation under varying load conditions. Generic units can drift outside the 24V ±10% window, causing erratic thermostat behavior and nuisance tripping of the control board's fuse.\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, wire nuts. Photograph all wiring connections before removing the old unit. Confirm 24V output before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Carrier \u003cstrong\u003eFB4CNF030L08ACAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909537649011,"sku":"CARRIE-FB4CNF030L08ACAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909537681779,"sku":"CARRIE-FB4CNF030L08ACAA-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_12de0a46-239c-489b-92b8-9467afc3b7b7.jpg?v=1782940912","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf030l08acaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}