OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAA060080ACKA

This OEM Carrier control transformer is the factory-specified replacement for the Carrier PG9MAA060080ACKA gas furnace. The transformer steps down your home's 120V line voltage to the 24V AC that powers every low-voltage control circuit in your furnace — the thermostat, gas valve, inducer relay, and control board. When this transformer fails, nothing in the control circuit receives power: the furnace will not respond to the thermostat, will not ignite, and will show no status LED activity whatsoever. A failed transformer is one of the most common causes of a completely unresponsive furnace.

• Specs: Primary 120V AC | Secondary 24V AC | 40VA rating | Step-down design | Factory-matched mounting footprint for direct drop-in fit
• OEM vs Generic: This OEM unit is built to Carrier's exact 40VA output specification and mounting configuration. Generic transformers frequently deviate in VA rating and lead length, risking underpowered control circuits and poor fitment — one reviewer noted a generic unit required modification to mount correctly.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Check voltage between R and C terminals on the control board after install to verify 24V output. Note: HT01BC116 has been superseded by OEM replacement part HT680054 — both are fully compatible.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Fits Carrier model PG9MAA060080ACKA gas furnace. OEM part number HT01BC116 has been updated to HT680054, which also replaces HT01BC116B, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and several additional superseded part numbers. Verify your existing transformer reads 120V primary and 24V secondary before ordering. Our fitment team is available to confirm compatibility before you buy.