OEM Carrier 40VA 120V/24V Control Transformer HT01BC116 for Model PG8MAA066110ABJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8MAA066110ABJA gas furnace. The transformer converts 120V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this component fails, the furnace loses all 24V control power: nothing responds, the thermostat goes blank, and the system will not attempt ignition. It is one of the first components to check when the furnace shows zero activity.

• Specs: 40VA capacity | 120V primary / 24V secondary | Step-down (class 2) | Wire lead connections | OEM part number HT01BC116 (superseded by HT680054)
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic units often suffer voltage sag under peak demand, causing intermittent lockouts and nuisance board faults.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removal. Confirm 24V output with a meter after installation before closing the panel.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG8MAA066110ABJA gas furnace. Also cross-references to Bryant and Payne units sharing the HT01BC116 transformer specification. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate before ordering. Our fitment team is available to confirm compatibility before you purchase.