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This is the factory OEM replacement transformer (part number HT01AW229) for the Carrier HC1CJX060000AAAA packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage system controls. When this part fails, the entire control circuit goes dead — the thermostat becomes unresponsive, the system won't call for heating or cooling, and no fault codes will even display. If you're measuring 120V on the primary side but zero volts on the secondary, this transformer is almost certainly the cause.
Compatibility: Designed and factory-specified for the Carrier HC1CJX060000AAAA packaged unit. Confirm your unit's control circuit voltage and VA requirements match the HT01AW229 spec before ordering. Our parts specialists are available to verify fitment — don't guess on a control circuit component. Order now and get same-day shipping on all in-stock parts.