OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAB060120ACSA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB060120ACSA gas furnace. It converts 120V line voltage down to 24V AC to power the low-voltage control circuit — including the thermostat, control board, gas valve, and all safety switches. When this transformer fails, the entire control circuit goes dead: the thermostat loses power, the furnace won't respond to calls for heat, and nothing operates. Original OEM part number HT01BC116 has been superseded by the current factory replacement HT680054, which ships in an authorized Carrier parts box and is a direct drop-in replacement with identical specifications.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Connection type: Wire leads with pre-installed insulated female connectors | Mounting type: Foot mount
• OEM vs Generic: OEM Carrier transformers are wound and tested to exact factory tolerances, ensuring stable 24V output under full load. Generic transformers often deliver inconsistent secondary voltage, which can cause nuisance lockouts, erratic thermostat behavior, and premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Label and photograph all wire connections before removing the old unit. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V output on C and R terminals after installation before restoring full power.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Fits Carrier model PG9MAB060120ACSA gas furnace. OEM part number HT01BC116 is superseded by HT680054 — both part numbers are covered by this listing. Also cross-references: HT01BC115, HT01BB126, HT01CT120, HT01BC120. Verify 120V primary / 24V secondary / 40VA rating on your unit's data plate before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — ships today.