OEM Carrier 40VA Control Transformer 120V–24V (HT01BC116) for Model PG9MAA036060AAKA

This OEM control transformer is the factory-specified replacement for the Carrier PG9MAA036060AAKA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition board. When this part fails, nothing in your furnace responds: the thermostat goes dark, the system will not call for heat, and the control board receives no power. A shorted low-voltage component (bad gas valve coil, wiring fault) is the most common cause of transformer failure, so always inspect the secondary circuit before installing a replacement.

• Specs: 40VA rating | 120V AC primary | 24V AC secondary | 60 Hz | Foot-mount configuration | Wire lead connections | Includes inline 3A fuse protection
• OEM vs Generic: This OEM transformer is factory-wound to exact Carrier tolerances for stable 24V output under full load. Generic units often deliver inconsistent secondary voltage, causing erratic board behavior, nuisance lockouts, and premature failure of low-voltage components.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify voltage is absent before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install and to check for secondary-side shorts before replacing). Photograph all wiring connections prior to removal. Note: OEM part HT01BC116 has been updated to successor part number HT680054 — both are fully interchangeable.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PG9MAA036060AAKA gas furnace. Also replaces legacy part numbers HT01BC116B, HT01BC115, HT01BB126, HT01BC120, and HT680054. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get back to heat fast.