OEM Carrier Furnace Control Transformer 120V–24V 40VA — HT01BC116 / HT680054 for Model PG8MAA048090ABJA

This OEM Carrier control transformer is the factory-specified replacement for the Carrier PG8MAA048090ABJA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering the low-voltage control circuit that operates your thermostat, gas valve, inducer, and all safety switches. When the transformer fails, the entire control circuit goes dead — your furnace will not respond to the thermostat, and no heating sequence will initiate. Note: OEM part number HT01BC116 has been superseded by HT680054, which is the current factory-authorized drop-in replacement shipped in a Carrier factory parts box.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Phase: Single | Mounting: Foot-mount bracket
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, protecting downstream components like the control board and gas valve. Generic units often run outside rated output voltage, risking nuisance lockouts or premature board failure.
• Install Difficulty: 2/5 — Shut off power at the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wire connections before removing the old unit. Check for a blown inline fuse on the secondary side before condemning the transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PG8MAA048090ABJA 80% AFUE gas furnace. Superseded part HT680054 also replaces cross-references HT01BC115, HT01BC120, HT01BB126, HT01CT120, and HT01AW115. Verify primary voltage (120V) on your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and ships today.