OEM Carrier Control Transformer 40VA 120V–24V for Model PG9MAA060100ACKA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAA060100ACKA gas furnace. The transformer steps down the 120V line-voltage supply to the 24V signal used by your thermostat, control board, gas valve, and every other low-voltage component in the system. When it fails, the result is total loss of control-circuit power — the thermostat goes dark, the furnace will not respond to any call for heat or cool, and nothing downstream operates. Replacing the transformer is one of the most cost-effective furnace repairs available.

• Specs: Primary Voltage: 120 VAC | Secondary Voltage: 24 VAC | VA Rating: 40VA | Frequency: 50/60 Hz | Single Phase | Wire-lead connections
• OEM vs Generic: This is a genuine OEM-specified transformer wound to exact VA and voltage tolerances. Off-brand units frequently run under-rated VA, which causes nuisance tripping of the furnace's 3A fuse and accelerated control-board wear.
• Install Difficulty: 2/5 — Power down and lock out the furnace at the disconnect before starting. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (to confirm 24V output after install). Photograph all low-voltage wiring before disconnecting. Note: OEM part number HT01BC116 has been superseded; current shipping part is HT680054, a direct factory replacement.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for Carrier model PG9MAA060100ACKA gas furnace. Also replaces cross-reference part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, and HT01AW115. Verify your existing transformer's primary voltage (120V) and VA rating (40VA) on the data plate before ordering. Need help confirming fitment? Our parts team is standing by.