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This is the factory OEM replacement transformer (part number HT01BC116) for the Carrier GB3AAV060135ADJA gas furnace. The transformer steps down 120V line voltage to 24V to power the control board, thermostat circuit, and low-voltage control components throughout the system. When this part fails, the entire control circuit loses power — symptoms include a completely unresponsive thermostat, a blank control board, and a furnace that won't start, heat, or respond to any input despite having line voltage present.
Compatibility: Designed and factory-specified for the Carrier GB3AAV060135ADJA gas furnace. Cross-reference OEM part number HT01BC116 against your unit's data plate and existing transformer label before ordering. If you need fitment confirmation, our HVAC parts team is available to verify compatibility before you purchase — same-day shipping guaranteed on in-stock parts.