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This OEM control transformer (part number HT01BC116) is the factory-specified replacement for the Carrier GB3AAV060135AEJA gas furnace. The transformer steps down 120V line voltage to the 24V signal that powers the thermostat, control board, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — the thermostat goes blank, no call for heat is recognized, and the furnace will not attempt to start. If your Carrier GB3AAV060135AEJA appears completely unresponsive even with confirmed 120V power at the unit, a failed transformer is one of the first components to test.
Compatibility: This transformer is engineered specifically for the Carrier GB3AAV060135AEJA gas furnace. Always verify the OEM part number on your existing transformer's label before ordering to confirm fitment. If you're unsure, our HVAC parts specialists can verify compatibility — contact us before you order and we'll make sure you get the right part the first time.