OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8JAA066110ABJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8JAA066110ABJA gas furnace. The transformer converts 120V line voltage to the 24V signal voltage that powers your thermostat, control board, gas valve, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — your furnace will not respond to the thermostat, ignition will not initiate, and in many cases nothing on the unit will function at all. If your furnace is completely unresponsive and your transformer measures anything other than ~24V AC on the secondary leads, this part is the culprit.

• Specs: Primary Voltage: 120 VAC | Secondary Voltage: 24 VAC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Replaces OEM part HT01BC116 (superseded by HT680054)
• OEM vs Generic: This is a genuine OEM-spec transformer wound to exact Carrier tolerances. Generic units often have inferior core laminations, resulting in voltage sag under load that causes intermittent lockouts, nuisance pressure switch trips, and premature control board failure.
• Install Difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph existing wire connections before removing the old transformer. Installation typically takes 20–30 minutes.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Confirmed fit for Carrier model PG8JAA066110ABJA gas furnace. This transformer also cross-references to multiple Carrier, Bryant, and Payne furnace platforms — verify your unit's data plate shows a 120V primary / 24V secondary / 40VA requirement before ordering. Our parts specialists are available to confirm fitment prior to purchase. Order now and get your furnace's control circuit restored — ships today.