OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAA048100ABKA

This is the OEM factory-specified control transformer for the Carrier PG9MAA048100ABKA gas furnace. The transformer steps down the 120V line voltage to the 24V AC signal that powers every low-voltage component in the system — thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the furnace will not respond to a call for heat, and no status codes are displayed on the board. Note: OEM part number HT01BC116 has been superseded by the current factory replacement HT680054 — a direct drop-in with identical specifications.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Frequency: 60Hz | Mounting type: Foot mount | Connection type: Wire leads with insulated female connectors
• OEM vs Generic: OEM transformers are wound to exact factory tolerances, delivering a stable 24V output under load. Generic units frequently produce low or fluctuating output voltage, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Photograph all wiring connections before removal. Confirm 24V output at C and R terminals on the control board after installation.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PG9MAA048100ABKA gas furnace. This OEM replacement also cross-references part numbers HT01BC116, HT01BC116B, HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several additional legacy numbers — making it one of the most widely applicable Carrier/Bryant/Payne furnace transformers available. Verify your data plate voltage rating before ordering. Our fitment team is available to confirm compatibility before you buy.