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This OEM step-down transformer (part #HT01AW230) is the factory-specified replacement for the Carrier FF1ANA024000AAAA fan coil unit. It converts 230V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing works. It is often the first component to check when a unit has completely stopped communicating.
Compatibility: Designed specifically for the Carrier FF1ANA024000AAAA fan coil unit. Confirm your unit's voltage requirements on the data plate before ordering — this transformer is rated for 230V primary input only. Our parts specialists are available to verify fitment before you purchase.