OEM Carrier 40VA 120V-24V Control Transformer for Model PG9MAA048080AFKA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAA048080AFKA gas furnace. The transformer steps down 120V line voltage to 24V to power the furnace control board, thermostat circuit, and all low-voltage control components. When this transformer fails — due to a short in the control circuit, a blown fuse, or simple age-related degradation — the entire furnace goes silent: no thermostat response, no ignition attempt, nothing works. Replacing it is one of the fastest, most cost-effective fixes in furnace repair.

• Specs: 40VA rating | 120V primary / 24V secondary | Single phase | 50/60 Hz | Step-down configuration | Wire lead connections | OEM part HT01BC116 (superseded by HT680054)
• OEM vs Generic: This OEM transformer is wound and rated to exact Carrier factory tolerances. Generic aftermarket transformers often vary in VA capacity and insulation class, risking nuisance tripping or premature control board failure.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph and label wire connections before removal. The transformer mounts directly to the furnace cabinet and uses push-on spade terminals.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship the same business day from our warehouse.

Compatibility: Designed for the Carrier PG9MAA048080AFKA gas furnace. This part also cross-references a wide family of Carrier, Bryant, and Payne furnace models that originally used HT01BC116. Always verify your unit's control circuit voltage (24V secondary) and VA requirements against your data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — contact us today.