OEM Carrier Control Transformer 40VA 120V/24V for Model GB1AAV048090AAJA

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier GB1AAV048090AAJA gas furnace. The transformer steps down line voltage from 120V to the 24V signal voltage required to power the thermostat, control board, gas valve, and all low-voltage components. When the transformer fails, the result is total control circuit loss — your thermostat goes blank, nothing responds, and the system will not attempt to start. A blown transformer is often caused by a short in the low-voltage wiring or a failed control board, so inspect the wiring harness before installing the replacement.

• Specs: Primary voltage 120VAC | Secondary voltage 24VAC | 40VA rating | OEM part number HT01BC116 | Factory-matched output for full low-voltage circuit compatibility
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Generic transformers often under-deliver on VA capacity, causing nuisance lockouts or premature failure under peak demand.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Label all low-voltage wires before disconnecting. Inspect for any shorted wiring that caused the original failure.
• Warranty: 1-year OEM factory warranty. Ships same business day from our stocked warehouse.

Compatibility: Engineered for the Carrier GB1AAV048090AAJA gas furnace. Confirm your existing transformer reads 120V primary / 24V secondary at 40VA by checking the data label on the original component before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping on all in-stock orders.