IMAGE COMING SOON
Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
This genuine OEM Carrier transformer (HT01BD230) steps line voltage down to the low-voltage 24V control power that runs the thermostat, relays, and control board in your FA4BNC036010AAAA fan coil unit. When the transformer fails, the system loses control power entirely: the thermostat goes dark, the blower won't start, and cooling stops, so a correct replacement is essential to restore operation. Manufactured to exact Carrier specifications for proper primary and secondary voltage ratings, this transformer is a direct-fit replacement that mounts and wires in the same as the original. Installation is a moderate task best suited to those comfortable with low-voltage wiring: shut off power, photograph the existing leads, transfer the wires to matching terminals, and secure the new unit. A licensed HVAC technician can handle it in well under an hour if you prefer. Backed by our genuine-parts guarantee, this transformer ensures dependable, code-compliant control power. In stock and ships same-day on orders placed before 3PM CST, getting your Carrier air handler back online quickly.
This part is compatible with Carrier model FA4BNC036010AAAA.
Same-day shipping before 3 PM CST. 30-day returns on uninstalled parts.