OEM Carrier Transformer 40VA 120V to 24V for Model GB1AAV060111AFJA

This is the factory OEM replacement transformer (part number HT01BC116) for the Carrier GB1AAV060111AFJA gas furnace. The transformer is the heartbeat of your furnace's control circuit — it steps down 120V line voltage to the 24V signal voltage required by the thermostat, control board, gas valve, and all low-voltage components. When the transformer fails, absolutely nothing responds: the thermostat goes dark, the furnace won't attempt ignition, and the system is completely dead. A failed transformer is often misdiagnosed as a control board failure, making this a critical first diagnostic check.

• Specs: 40VA rated | 120V primary input | 24V secondary output | Direct OEM replacement for part number HT01BC116 | Factory-matched impedance and thermal protection
• OEM vs Generic: The OEM HT01BC116 transformer is wound and protected to Carrier's exact specifications. Generic transformers frequently lack proper thermal cutoffs, risking repeat failures or downstream control board damage from voltage fluctuations.
• Install difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Label all wiring connections before removing the old transformer. Most technicians complete this repair in under 30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV060111AFJA 80% AFUE gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — same-day shipping on all stocked OEM parts.