OEM Carrier Furnace Control Transformer 40VA 120V–24V for Model PG9MAA048080AEKA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAA048080AEKA gas furnace. The transformer converts 120V line voltage down to the 24V AC signal that powers every low-voltage component in the system — the thermostat circuit, gas valve, inducer relay, and control board. When this transformer fails, the furnace goes completely dead: no thermostat response, no ignition attempt, and no error codes on the board. It is often the first component to inspect when nothing on the furnace responds to a call for heat.

• Specs: 40VA capacity | 120V primary | 24V secondary | 60 Hz single-phase | Compact foot-mount design | Wire lead connections with insulated female quick-connects
• OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory VA and voltage tolerances. Generic units frequently run outside rated VA capacity, causing premature failure of the control board and other low-voltage components — OEM is the only recommended choice for long-term reliability.
• Install difficulty: 2/5 — Shut off power at the breaker and verify with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Label all wire connections before removal. Measure 24V between the R and C terminals on the control board after installation to confirm correct operation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MAA048080AEKA gas furnace. This part supersedes legacy OEM part number HT01BC116 and is compatible across a wide range of Carrier, Bryant, and Payne furnaces using a 40VA 120V/24V transformer. Verify your unit's data plate voltage and VA rating before ordering. Have a compatibility question? Our HVAC parts team confirms fitment before you buy — contact us anytime.