{"product_id":"carrier-fx4cnf018t00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FX4CNF018T00AAAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V to 24V for Model FX4CNF018T00AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FX4CNF018T00AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V low-voltage signal used by your thermostat, control board, and all safety circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't heat or cool, and no error codes are generated because there's simply no power to produce them. If your air handler is completely unresponsive and your thermostat shows a blank screen despite a working power supply, this transformer is the first component to test.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01CN241 | Factory-matched electrical tolerance for reliable low-voltage output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and tested to Carrier's exact VA rating and insulation standards. Undersized or off-tolerance generic transformers can overdraw current, trip the secondary fuse repeatedly, or fail prematurely under normal control circuit loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Label all 24V wiring before disconnecting. Confirm incoming 120V is off before touching primary leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders ship 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 \u003cstrong\u003eCarrier FX4CNF018T00AAAA\u003c\/strong\u003e fan coil air handler. Always verify voltage ratings and VA requirements on your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909485252979,"sku":"CARRIE-FX4CNF018T00AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909485285747,"sku":"CARRIE-FX4CNF018T00AAAA-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_a210326d-ddc2-4163-9818-91ac523f9434.jpg?v=1782941178","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fx4cnf018t00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}