OEM Carrier 40VA Control Transformer for Model GB3AAV060115ACJA

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB3AAV060115ACJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat circuit, control board, gas valve, and all low-voltage controls. When this component fails, the entire control circuit goes dark — the thermostat loses power, the furnace will not respond to any call for heat or cooling, and in many cases the system appears completely dead. A failed transformer is often mistaken for a bad control board, making correct diagnosis essential before ordering parts.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched output for full control circuit compatibility
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact VA and voltage tolerances required by the Carrier GB3AAV060115ACJA control board. Undersized or off-tolerance generic transformers can drop voltage under load, causing erratic board behavior, nuisance lockouts, or premature failure of downstream components.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 0V at the transformer primary before touching any wiring. Label or photograph all 24V secondary connections prior to removal.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier GB3AAV060115ACJA gas furnace. Confirm your existing transformer reads 120V primary / 24V secondary and carries a 40VA rating before ordering. If you are unsure of fitment, our parts specialists will verify compatibility at no charge before your order ships.