OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAA036080AAKA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAA036080AAKA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering every low-voltage component in your system — including the thermostat circuit, gas valve, inducer relay, and control board. When it fails, nothing responds: the thermostat goes blank, the furnace won't fire, and the entire control circuit goes dead. Originally sold under part number HT01BC116, this part has been superseded by OEM part number HT680054 — a factory-authorized drop-in replacement shipped in a Carrier-branded parts box.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | Frequency: 60Hz | Mounting: Foot mount | Connection: Wire leads with pre-terminated connectors
• OEM vs Generic: OEM transformers are wound to exact factory VA tolerance, ensuring stable 24V output under full system load. Generic units often under-deliver at peak demand, causing nuisance lockouts, erratic thermostat behavior, or premature control board failure.
• Install Difficulty: 2/5 — Turn off all power to the furnace at the breaker and disconnect switch before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching leads). Photograph all wire connections before removal. Test output voltage (should read ~24–28V AC) after install before closing the panel.
• Warranty: 1-year OEM factory warranty on HT680054 successor part. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PG9MAA036080AAKA gas furnace. OEM part HT01BC116 is discontinued; HT680054 is the current factory-authorized direct replacement and installs identically. Also cross-references HT01BC115, HT01BB126, HT01BC120, and several other legacy Carrier/Bryant/Payne transformer part numbers — making it an excellent stock replacement for multi-unit service calls. Verify your unit's control voltage requirement (24V) on the data plate before ordering. Questions about fitment? Our team confirms compatibility before you order — order today and ships today.