{"product_id":"carrier-fy4anf018008aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FY4ANF018008AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FY4ANF018008AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier FY4ANF018008AAAA\u003c\/strong\u003e fan coil unit. The transformer converts 120V line voltage down to the 24V AC signal that powers the entire control circuit — including the thermostat, control board, and all low-voltage relays. When the transformer fails, the entire system goes silent: the thermostat goes blank, no calls for heating or cooling are answered, and the unit will not respond to any commands. A failed transformer is often misdiagnosed as a control board failure, making this an essential first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V secondary output | OEM part number HT01CN241 | Factory-matched terminals for direct plug-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control circuitry. Undersized or off-tolerance generic transformers can cause nuisance tripping, brownout conditions on the 24V circuit, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect and breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring connections before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 specifically for the Carrier \u003cstrong\u003eFY4ANF018008AAAA\u003c\/strong\u003e fan coil unit. Always confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us any time.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909468868979,"sku":"CARRIE-FY4ANF018008AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909468901747,"sku":"CARRIE-FY4ANF018008AAAA-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_04cefeba-4e54-420c-b5d2-a0897f5d3f14.jpg?v=1782939714","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy4anf018008aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}