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This OEM replacement transformer (part# HT01CN241) is the factory-specified control circuit transformer for the Carrier FZ4ANP061L15AAAA fan coil air handler. The transformer steps down incoming 120V line voltage to the 24V AC signal required to power the thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and no error codes will display because the board itself has lost power.
Compatibility: Designed specifically for the Carrier FZ4ANP061L15AAAA fan coil air handler. Confirm your existing transformer's input/output voltage and VA rating against your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.