OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8UAA066111ABJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA066111ABJA gas furnace, cross-referencing original part number HT01BC116 (superseded by HT680054). The transformer steps down 120V line voltage to the 24V AC signal that powers the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition board. When it fails, the furnace goes completely unresponsive: the thermostat calls for heat but nothing happens, or you may notice a blown 3A fuse on the control board as a telltale sign of transformer failure.

• Specs: Primary voltage: 120 VAC | Secondary voltage: 24 VAC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Replaces OEM part HT01BC116 / HT680054
• OEM vs Generic: This is a genuine OEM Carrier transformer wound to exact factory VA and impedance specifications. Generic aftermarket transformers often run off-tolerance, causing erratic 24V rail voltage, nuisance board faults, and premature control board failure.
• Install Difficulty: 2/5 — Power down the furnace and verify 0V at the transformer primary before touching any wires. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Label all wire connections before removal. Check and replace the 3A fuse on the control board if blown — a failed transformer is frequently the cause.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8UAA066111ABJA gas furnace. This part also supersedes multiple legacy Carrier/Bryant/Payne transformer part numbers including HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and HT01AA012. Always verify primary voltage (120V) and VA rating (40VA) on your unit's data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy.