OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8UAA060111AAJA (HT01BC116 / HT680054)

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8UAA060111AAJA gas furnace. It converts 120V line voltage to the 24V AC signal that powers every low-voltage component in your system — the thermostat, gas valve, control board relays, and zone controls. When the transformer fails, the entire control circuit goes dead: the furnace won't respond to the thermostat, the board shows no life, and you may measure 0V between the R and C terminals on your control board. This is the correct OEM replacement to restore full operation.

• Specs: Input 120V AC | Output 24V AC | 40VA rating | Foot-mount configuration | Wire lead connections | 60 Hz | Replaces OEM part HT01BC116 (superseded by HT680054)
• OEM vs Generic: OEM Carrier transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards from under- or over-voltage. Generic units often run outside rated tolerances, risking repeat transformer failure or board damage.
• Install Difficulty: 2/5 — Turn off power at the breaker and confirm 0V before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Photograph all wiring connections before disconnecting. Verify 24V output at R–C terminals after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8UAA060111AAJA packaged gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are covered by this listing. Cross-references include HT01BC115, HT01BB126, HT01BC120, and HT01AW115. Confirm your unit's data plate shows a 120V primary and 24V secondary before ordering. Have a fitment question? Our HVAC parts team verifies compatibility before you buy — order with confidence and get your furnace back online today.