OEM Carrier Furnace Transformer 40VA 120V–24V for Model PG9MAB060100LBSA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB060100LBSA gas furnace. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, control board, gas valve, and zone controls. When this transformer fails, your furnace will appear completely unresponsive: the thermostat goes dark, nothing calls for heat, and no error codes are displayed because the control board itself has lost power. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing more expensive components.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Phase: Single | Mounting: Foot-mount | Connection: Wire leads with insulated female quick-connects
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory tolerances, ensuring stable 24V output under load. Generic alternatives frequently deliver slightly off-voltage output (22–26V), which can cause erratic thermostat behavior, nuisance lockouts, or premature control board failure.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage with a multimeter before touching any wiring. Photograph all wire connections before disconnecting the old transformer. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Note: OEM part number HT01BC116 has been superseded by HT680054 — both are the same factory-spec unit.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Designed for the Carrier PG9MAB060100LBSA gas furnace. Supersedes OEM part numbers HT01BC116, HT01BC116B, HT01BC115, HT01BB126, HT01CT120, and HT01BC120. Always verify your unit's data plate voltage rating before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us anytime.