{"product_id":"carrier-fy5bnf042000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 24V for FY5BNF042000AAAA — HT01CN241","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FY5BNF042000AAAA (HT01CN241)\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FY5BNF042000AAAA\u003c\/strong\u003e fan coil unit. Its job is to step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage components. When it fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and no safety or diagnostic functions operate. A failed transformer is often misdiagnosed as a bad control board, so always check transformer output with a multimeter before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V AC | OEM part number HT01CN241 | Factory-matched output tolerance for stable low-voltage operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer, wound and insulated to exact factory specifications. Generic aftermarket transformers frequently under-deliver VA capacity, causing voltage sag under load that triggers nuisance lockouts and premature control board failure.\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, needle-nose pliers, multimeter. Photograph or label all low-voltage wiring before disconnecting. Verify 24V output at secondary terminals before closing the cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock units ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFY5BNF042000AAAA\u003c\/strong\u003e fan coil unit. Cross-reference OEM part number HT01CN241 against your unit's wiring diagram and data plate to confirm primary voltage and VA rating before ordering. Our parts specialists are available to verify fitment — order with confidence and get back to comfort faster.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909459005811,"sku":"CARRIE-FY5BNF042000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909459038579,"sku":"CARRIE-FY5BNF042000AAAA-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_fe342345-9325-4d75-8b51-cf4fadf627dd.jpg?v=1782942588","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy5bnf042000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}