OEM Carrier 40VA Control Transformer for Model GA1AAD060120AAJA

This is the factory OEM replacement transformer (part# HT01BC116) for the Carrier GA1AAD060120AAJA gas furnace. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When it fails, absolutely nothing works: the thermostat goes dark, the system won't respond to any call for heat or cooling, and no diagnostic codes appear on the control board. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Direct plug-in or screw-terminal mount | Factory-matched for Carrier GA1AAD060120AAJA
• OEM vs Generic: OEM transformers are wound to exact VA tolerances ensuring stable 24V output under full control-circuit load. Undersized or off-spec generic units can sag voltage during demand, causing erratic board behavior, nuisance lockouts, and premature contactor failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Photograph existing wiring connections before removing the old unit. Check for a blown fuse on the control board — a shorted wire downstream often takes out the transformer and the board fuse simultaneously.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier GA1AAD060120AAJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.