OEM Carrier Furnace Transformer 40VA 120V–24V for Model PG9MAB060100AASA (HT01BC116 / HT680054)

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB060100AASA gas furnace. The transformer converts 120V line voltage to the 24V AC needed to power the thermostat, control board, gas valve, and all low-voltage components in your system. When it fails, nothing in the furnace will respond — no thermostat display, no ignition sequence, and no heat. If you're seeing a completely dead control board or a system that won't respond to any thermostat command, a failed transformer is one of the first components to test.

• Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 50/60 Hz | Phase: Single | Mounting: Foot-mount | Connection: Wire leads with insulated female quick connects
• OEM vs Generic: This is a genuine OEM Carrier replacement (current OEM part HT680054, direct successor to HT01BC116). OEM transformers are wound to exact factory VA and voltage tolerances, protecting downstream components like the control board and gas valve from voltage irregularities that generic units can introduce.
• Install difficulty: 2/5 — Turn off power at the breaker and confirm zero voltage before touching any wires. Photograph all wiring connections before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label leads before removal to avoid mis-wiring on reinstall.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 5 PM local time.

Compatibility & Part Note: Fits Carrier PG9MAB060100AASA gas furnaces. Original OEM part number HT01BC116 has been superseded by HT680054 — both part numbers are fulfilled by the same current OEM unit shipped in a Carrier factory-authorized box. Also cross-references: HT01BC115, HT01BC116B, HT01BB126, HT01CT120, HT01BC120. Verify your unit's control board voltage requirements before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order now and get same-day shipping!