OEM Carrier Transformer 40VA 120V–24V for Model GA2AAD024071ACJA

This OEM control circuit transformer (part number HT01BC116) is the factory-specified replacement for the Carrier GA2AAD024071ACJA system. The transformer steps line voltage down from 120V to the 24V AC signal that powers your thermostat, control board, and all low-voltage control wiring. When this component fails, the entire control circuit goes dead — you'll see a blank thermostat display, no response to calls for heating or cooling, and zero activity at the air handler or furnace board. It's often the first component to inspect when a system appears completely unresponsive.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BC116 | Factory-matched output voltage and VA capacity for stable, reliable control circuit operation
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier engineering. Undersized or off-tolerance generic units can cause nuisance lockouts, erratic thermostat behavior, and premature control board failure — OEM is always the safer choice.
• Install difficulty: 2/5 — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all low-voltage wiring connections before removing the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier GA2AAD024071ACJA. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you buy. Order today and your part ships the same business day.