OEM Carrier 120V-24V 40VA Control Transformer for Model PG8UAA036111AAJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA036111AAJA gas furnace. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this part fails, the entire control circuit goes dead: the thermostat goes blank, the furnace will not respond to any call for heat, and the system may appear completely inoperative. It is one of the first components to check when a furnace shows zero activity.

• Specs: Primary voltage: 120VAC | Secondary voltage: 24VAC | VA rating: 40VA | Wire lead connections | OEM part HT01BC116 (superseded by HT680054) | Factory-matched output tolerance
• OEM vs Generic: OEM transformers are wound and tested to Carrier's exact 40VA output specification. Aftermarket units frequently deliver inconsistent secondary voltage, which can confuse or damage the control board and thermostat. Always use OEM when replacing a transformer on a fully functional board.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is off before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all wiring connections before removal. Confirm secondary 24V output with a meter before closing the panel.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — order by 3 PM local time for guaranteed same-day dispatch.

Compatibility: Engineered for the Carrier PG8UAA036111AAJA gas furnace. This transformer also fits a wide range of Carrier, Bryant, and Payne furnace models — verify your unit's data plate shows a 120V primary / 24V secondary / 40VA transformer requirement before ordering. OEM part number HT01BC116 has been superseded by HT680054; both are interchangeable and this listing ships the current production unit. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.