OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG9MAA048080ADKA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAA048080ADKA gas furnace. It converts 120V line voltage down to the 24V required to power the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition sequencing. When this transformer fails, nothing in the furnace responds: no thermostat display, no ignition attempt, and no error codes — because the 24V control circuit is completely dead.

• Specs: 40VA capacity | 120V primary | 24V secondary | 50/60 Hz single-phase | Compact 3" × 2-2/16" × 2" footprint | Wire lead connections
• OEM vs Generic: This is a genuine Carrier OEM transformer built to exact factory VA and voltage tolerances. Generic units often run at lower VA headroom, causing nuisance trips and shortened control board life under full circuit load.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting leads. The transformer is typically mounted on the blower deck or burner vestibule panel.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PG9MAA048080ADKA gas furnace. OEM part number HT01BC116; superseded by Carrier OEM part HT680054 — both are identical in specification and fitment. Also fits many Bryant and Payne models sharing the same control platform. Always verify primary voltage and VA rating on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — order today and get it shipped the same day.