Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.
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This OEM Carrier transformer is the precise replacement for the FV4BNB003T00AAAA fan coil air handler and the component that powers your system's entire low-voltage control circuit. It steps line voltage down to 24V to run the control board, thermostat, and relays. Symptoms of a failed transformer include a completely dead air handler, a low-voltage fuse that blows repeatedly, or a thermostat with no display. Built to factory specification, this transformer matches the original unit's VA rating, primary and secondary voltages, and mounting footprint, so it installs without modification. The swap is a moderate DIY job: disconnect power at the breaker, label and transfer each lead, fasten the new transformer, and restore power — typically about 30 minutes with a screwdriver and nut driver. A genuine Carrier transformer protects your control board and gives you the dependable performance that generic replacements often fall short of. We stock this part and ship it same-day on all orders placed before 3PM CST.
This part is compatible with Carrier model FV4BNB003T00AAAA.
Same-day shipping before 3 PM CST. 30-day returns on uninstalled parts.