OEM Carrier 40VA Control Transformer 120V/24V for Model PG8UAA024045ABJA (Replaces HT01BC116)

This OEM Carrier control transformer is the factory-specified replacement for the Carrier PG8UAA024045ABJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage control circuits. When this component fails, the furnace loses all communication with the thermostat — resulting in a completely unresponsive system, blown low-voltage fuse, or a furnace that won't call for heat at all. Replacing it is one of the most cost-effective repairs in HVAC service.

• Specs: 40VA rating | 120V primary voltage | 24V secondary voltage | 50/60 Hz single-phase | OEM part HT01BC116 (superseded by HT680054)
• OEM vs Generic: OEM transformers are wound and rated to exact factory tolerances, ensuring stable 24V output under full control-circuit load. Generic units can output unregulated voltage that stresses the control board and gas valve coil over time.
• Install Difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all 24V wires before disconnecting. Verify secondary output voltage after installation before restoring full power.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Fits Carrier model PG8UAA024045ABJA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are fulfilled as the current OEM replacement. Also cross-references: HT01BC115, HT01BB126, HT01CT120, HT01BC120. Verify primary voltage (120V) on your unit's data plate before ordering. Not sure it fits? Our fitment team will confirm compatibility before you check out.