{"product_id":"carrier-transformer-fb4bnf030005aaaa","title":"OEM Carrier Transformer TRANS001 for Model FB4BNF030005AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer TRANS001 for Model FB4BNF030005AAAA\u003c\/h1\u003e\n\u003cp\u003eThis OEM Carrier transformer is the exact replacement low-voltage transformer for your Carrier FB4BNF030005AAAA fan coil unit. It steps down incoming 120\/208\/240V line voltage to the 24V control circuit that powers your thermostat, control board, and contactor. A failed transformer is one of the most common causes of a completely dead control system, blown low-voltage fuses, or a thermostat that won't light up. Built to factory specifications, this part guarantees correct voltage, polarity, and VA rating so your air handler operates reliably. Installation is a moderate DIY job for anyone comfortable working safely with disconnected power — typically two line-side leads and two secondary leads on a labeled terminal block, about 20-30 minutes with basic hand tools. Always shut off power at the breaker before servicing. Choosing the genuine OEM Carrier part ensures a precise fit and protects your warranty. In stock and ready to ship same-day on all orders placed before 3PM CST, so you can get your system back up and running fast.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FB4BNF030005AAAA.\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":62951560446323,"sku":"carrier-transformer-fb4bnf030005aaaa","price":49.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fb4bnf030005aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}