{"product_id":"carrier-transformer-fb4bnb042000aaaa","title":"OEM Carrier Transformer ET00BR230 for Model FB4BNB042000AAAA","description":"\u003cdiv\u003e\n\u003ch1\u003eOEM Carrier Transformer ET00BR230 for Model FB4BNB042000AAAA\u003c\/h1\u003e\n\u003cp\u003eThis genuine OEM Carrier transformer (ET00BR230) steps the incoming 230V line voltage down to the 24V control voltage your FB4BNB042000AAAA fan coil needs to power the thermostat, relays, and control circuit. When a transformer fails, the system goes completely dead at the low-voltage side: no thermostat display, no fan, no call for heating or cooling. This factory-matched replacement delivers the correct VA rating and 24V secondary output specified for the FB4BNB042000AAAA, ensuring stable, reliable control power. Installation is a moderate job best suited to someone comfortable with low-voltage wiring: cut power at the breaker, photograph and label the primary and secondary leads, mount the new transformer, and reconnect the matching wires. Expect about 30-45 minutes. Always verify your primary voltage and check for a shorted control wire that may have caused the original failure. Get your system back online with a durable, spec-correct part. In stock and ships same-day when you order before 3PM CST.\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis part is compatible with Carrier model FB4BNB042000AAAA.\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":62951882064243,"sku":"carrier-transformer-fb4bnb042000aaaa","price":49.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/carrier-transformer-fb4bnb042000aaaa","provider":"National HVAC Parts","version":"1.0","type":"link"}