{"product_id":"carrier-fy5bnf018005aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120\/24V for FY5BNF018005AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FY5BNF018005AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FY5BNF018005AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat, and all low-voltage switching circuits. When this transformer fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and no fault codes will display because the board itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | OEM part number HT01CN241 | Factory-matched for Carrier FY5BNF018005AAAA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and insulated to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic units frequently underperform at rated VA, causing nuisance tripping of the built-in thermal fuse and intermittent control failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and confirm zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all low-voltage wiring connections before disconnecting. The transformer mounts to the control panel and connects to both line-voltage and 24V terminals — match wire colors and terminal labels precisely.\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 warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003eFY5BNF018005AAAA\u003c\/strong\u003e fan coil unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you purchase — never guess on a control circuit component.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909464609139,"sku":"CARRIE-FY5BNF018005AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909464641907,"sku":"CARRIE-FY5BNF018005AAAA-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_fb34525a-3bd6-465a-b27c-6f3592f4f503.jpg?v=1782938681","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy5bnf018005aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}