{"product_id":"carrier-transformer-fb4bnf030010aaaa","title":"OEM Carrier Transformer HT01BD250 for Model FB4BNF030010AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer HT01BD250 for Model FB4BNF030010AAAA\u003c\/h1\u003e\n\u003cp\u003ePower your control circuit reliably with this genuine OEM Carrier transformer, the exact replacement for the FB4BNF030010AAAA fan coil air handler. The transformer converts incoming line voltage to the 24V supply that drives your thermostat, control board, and contactor, and when it fails the entire low-voltage system goes dead — no fan, no call for heating or cooling. Built to Carrier's factory specifications, it installs in the original location using matching primary and secondary leads, so there's no need to rewire or modify the cabinet. Replacement is a moderate DIY job for anyone comfortable working inside the air handler with power disconnected; most installs take about 30 minutes with basic hand tools and a meter to confirm output. Fitting the correct OEM transformer safeguards your board and downstream electronics from under- or over-voltage damage and eliminates nuisance failures. Orders placed before 3PM CST ship same-day so your system is back online quickly. Genuine Carrier quality built for long, dependable service.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FB4BNF030010AAAA.\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":62951505265011,"sku":"carrier-transformer-fb4bnf030010aaaa","price":49.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fb4bnf030010aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}