{"product_id":"carrier-fb4cnf030010acaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF030010ACAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FB4CNF030010ACAA\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 FB4CNF030010ACAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit loses power — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and no fault codes are generated because the board itself has no power to operate.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Compatible with standard 24V thermostat wiring | Factory-matched output tolerances for reliable control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic transformers can overheat under normal control circuit loads, blow fuses repeatedly, or cause erratic thermostat behavior — costing more in callbacks than the part itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph existing low-voltage wiring connections before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for \u003cstrong\u003eCarrier FB4CNF030010ACAA\u003c\/strong\u003e fan coil units. Always verify your unit's data plate voltage and VA rating before ordering. If you're unsure of fitment, our parts specialists can confirm compatibility before you purchase — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909537845619,"sku":"CARRIE-FB4CNF030010ACAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909537878387,"sku":"CARRIE-FB4CNF030010ACAA-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_69105469-17aa-4693-8836-abe918d581b8.jpg?v=1782939523","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf030010acaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}