{"product_id":"carrier-transformer-fx4bnf036000aaaa","title":"OEM Carrier Transformer EF18DW103 for Model FX4BNF036000AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer EF18DW103 for Model FX4BNF036000AAAA\u003c\/h1\u003e\n\u003cp\u003eThis OEM Carrier control transformer steps down incoming line voltage to the low-voltage power your thermostat, control board, and relays rely on to operate. Engineered as a direct-fit replacement for the Carrier FX4BNF036000AAAA fan coil unit, it delivers stable, reliable 24V output so your system responds correctly to every call for heating or cooling. When a transformer fails, the entire control circuit goes dead — no thermostat display, no blower, no response — making this an essential part to keep on hand. Built to exact OEM specifications, it ensures proper voltage matching and protects downstream components from electrical damage. Installation is a moderate repair best handled by a qualified technician: disconnect power, match the primary and secondary leads, and mount in roughly 20 to 30 minutes. Restore full control functionality to your Carrier air handler with a genuine factory-grade part. In stock and ships same-day when you order before 3PM CST, minimizing system downtime and getting your comfort back fast.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FX4BNF036000AAAA.\u003c\/p\u003e\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eSame-day shipping before 3 PM CST. 30-day returns on uninstalled parts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":62942895243635,"sku":"carrier-transformer-fx4bnf036000aaaa","price":43.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-carrier-transformer-fx_710e63e9-10d0-471d-b1f6-a9e8d4f26f0a.jpg?v=1781473458","url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fx4bnf036000aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}