OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG9MAA048100ACKA

This OEM step-down transformer is the factory-authorized replacement for the Carrier PG9MAA048100ACKA gas furnace, originally referenced under part number HT01BC116 (superseded by HT680054). The transformer converts 120V line voltage down to 24V AC to power the furnace's entire low-voltage control circuit — including the thermostat, gas valve, inducer, and control board. When this component fails, the furnace will appear completely unresponsive: no call for heat, no LED codes, no fan activity — because the 24V control circuit has no power source.

• Specs: 40VA rating | 120V primary input | 24V secondary output | 60 Hz single-phase | Foot-mount design | Wire lead connections with insulated female quick-connects
• OEM vs Generic: This OEM unit meets Carrier's exact VA rating and insulation class. Undersized or off-tolerance generic transformers can overheat, trip thermal cutoffs, and damage downstream low-voltage components including the control board.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting leads. Verify 24V output at R and C terminals on the control board after install.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PG9MAA048100ACKA gas furnace. Also supersedes legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and HT01AA012. Confirm your unit's original part number on the data plate or wiring diagram before ordering. Need fitment help? Our HVAC parts specialists verify compatibility before your order ships — no guesswork required.