OEM Carrier Furnace Control Transformer 40VA 120V–24V for Model PG9MAA060140ACKA

This is the factory-specified OEM step-down transformer for the Carrier PG9MAA060140ACKA gas furnace. Originally sold as part number HT01BC116 and updated by Carrier to the current superseding part HT680054, this transformer converts 120V line voltage down to 24V AC to power all low-voltage control-circuit components — including the thermostat, control board, gas valve, and inducer relay. When this transformer fails, the entire control circuit goes dark: you'll see a blank thermostat, no response to heat calls, and no furnace activity whatsoever, even though line voltage is present at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | 50/60 Hz | Single phase | Compact foot-mount design: 3" L × 2-3/16" W × 2" H | Wire lead connections
• OEM vs Generic: This OEM unit is built to Carrier's exact VA and voltage tolerances. Undersized or off-tolerance generic transformers commonly overheat, trip thermal protection, or fail prematurely — especially when a low-voltage short is present in the circuit.
• Install difficulty: 2/5 — Shut off all power to the furnace before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always check for a low-voltage short before replacing the transformer — an unresolved short will destroy the new unit. Photograph wiring before disconnecting leads.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Fits Carrier PG9MAA060140ACKA gas furnace. This part also supersedes legacy numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, HT01AQ110, HT01CT210, and HT01CT20006. Verify your unit's data plate before ordering, or contact our team for free fitment confirmation. Order by 5 PM and your part ships today.