{"product_id":"carrier-fc4cnf030000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FC4CNF030000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FC4CNF030000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FC4CNF030000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage from 120V to the 24V signal voltage required to power the thermostat, control board, and all low-voltage switching components. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any commands, and nothing operates. A failed transformer is often caused by a shorted control wire or a faulty component that draws excess current and burns out the secondary winding.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120VAC | Output 24VAC | 40VA rating | OEM part number HT01CN241 | Factory-matched windings and mounting footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances, ensuring reliable 24V delivery under full control-circuit load. Generic transformers frequently underperform at rated VA, causing nuisance lockouts, erratic thermostat behavior, and premature secondary burnout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts. Always label low-voltage wiring before removal and inspect all 24V wiring for shorts prior to installing the new transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFC4CNF030000AAAA\u003c\/strong\u003e fan coil unit. Verify input\/output voltage and VA rating on your existing transformer's label before ordering. If you are unsure of fitment, our HVAC parts specialists will confirm compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909525361011,"sku":"CARRIE-FC4CNF030000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909525393779,"sku":"CARRIE-FC4CNF030000AAAA-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_c6cbfa73-aca6-45ab-9d68-3cb14b5634f8.jpg?v=1782940959","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fc4cnf030000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}