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This OEM control transformer (part number HT01CN241) is the factory-specified replacement for the Carrier FX4CNB060000AAAA fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, relay coils, and control board. When this component fails, the thermostat goes completely dark, the system makes no response to any call for heating or cooling, and no error codes are generated because the board itself loses power.
Compatibility: Designed specifically for the Carrier FX4CNB060000AAAA 5-ton fan coil air handler. Confirm the 120V primary / 24V secondary / 40VA rating on your unit's data plate before ordering. Not sure it's the right part? Our HVAC parts specialists verify fitment before you order — order with confidence.