OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
This OEM step-down transformer (part number HT01BC116) is the factory-specified replacement for the Carrier GB1AAV060155AEJA gas furnace. The transformer converts 120V line voltage down to the 24V signal required to power the control board, thermostat circuit, and all low-voltage control components. When this part fails, the entire control circuit goes dead — your thermostat becomes unresponsive, the furnace won't initiate any heating cycle, and no diagnostic fault codes will appear because the board itself has no power to operate.
Compatibility: Designed and factory-matched for the Carrier GB1AAV060155AEJA gas furnace. Before ordering, confirm the existing transformer's VA rating and input/output voltages shown on its label match this listing. If your control board is also unresponsive after transformer replacement, inspect for a blown 3A fuse on the board. Need fitment help? Our HVAC parts specialists confirm compatibility before you order — reach out via chat or phone.