OEM Carrier Control Transformer 120V–24V 40VA for Model PG8MAA048110ADJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8MAA048110ADJA gas furnace. It converts 120V line voltage down to 24V to power the low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat loses power, nothing responds, and the furnace will not attempt to start. A failed transformer is often misdiagnosed as a bad control board, making correct identification of this part critical before replacing more expensive components.

• Specs: Primary Voltage: 120VAC | Secondary Voltage: 24VAC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | OEM Part: HT01BC116 (superseded by HT680054)
• OEM vs Generic: This is a genuine OEM-spec transformer engineered to Carrier's exact VA tolerance and insulation class. Generic transformers frequently run outside rated VA, causing nuisance tripped fuses and premature control board failure.
• Install difficulty: 2/5 — Turn off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Label all low-voltage wires before removing the old transformer. The transformer mounts inside the furnace cabinet and connects to both the line-voltage harness and the 24V control wiring.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for Carrier model PG8MAA048110ADJA gas furnaces. OEM part number HT01BC116 has been superseded by HT680054 — both are covered by this listing. Verify your unit's data plate shows 120V primary control circuit before ordering. Our team is available to confirm fitment prior to purchase — order with confidence and get your furnace back online today.