OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAA060140ABKA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAA060140ABKA gas furnace. Originally sold under part number HT01BC116, this transformer has been superseded by the current OEM part HT680054 — a direct, factory-authorized drop-in replacement. The transformer converts 120V line voltage to 24V AC, powering all low-voltage control circuit components including the thermostat, control board, gas valve, and inducer relay. When it fails, the entire control circuit goes dead: the furnace will not respond to the thermostat, no status codes will display, and nothing will operate.

• Specs: Input Voltage: 120V AC | Output Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Mounting Type: Foot mount | Connection: Wire leads | Includes 3A inline fuse protection
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Generic units often run slightly low on output voltage, causing erratic board behavior, nuisance lockouts, and premature control board failure.
• Install Difficulty: 2/5 — Shut off power at the breaker and confirm voltage is zero before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph existing wiring before disconnecting. Check C and R terminals on the control board after installation to confirm 24V output.
• Warranty: 1-year OEM factory warranty included. Ships same business day from our warehouse — order by 3PM for next-business-day delivery.

Compatibility: Fits Carrier model PG9MAA060140ABKA gas furnace. OEM part HT01BC116 has been superseded by HT680054 — both numbers are cross-referenced and fulfilled with the current factory replacement unit. Also cross-references: HT01BC115, HT01BB126, HT01BC120, HT01AW115, and HT01CT120. Verify your unit's control voltage requirement is 24V before ordering. Need fitment confirmation? Our HVAC specialists verify compatibility before you buy.