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This OEM step-down transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB3AAV060135ACJA gas furnace. The transformer converts 120V line voltage down to 24V AC to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this component fails, the system goes completely silent: the thermostat goes blank, no staging occurs, and the furnace will not respond to any call for heat. A blown fuse on the secondary side or a shorted control wire are the most common causes of transformer failure.
Compatibility: Designed for the Carrier GB3AAV060135ACJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you purchase.