OEM Carrier 40VA Control Transformer 120V–24V (HT01BC116 / HT680054) for Model PG8UAA024065ABJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8UAA024065ABJA gas furnace. The transformer converts 120V line voltage to the 24V AC signal that powers every low-voltage control circuit in your system — including the thermostat, gas valve, inducer relay, and control board. When this component fails, the entire control circuit goes dark: the thermostat goes blank, the furnace won't respond to heat calls, and in some cases the system will blow a low-voltage fuse repeatedly. Note: OEM part number HT01BC116 has been superseded by the current factory part number HT680054 — this listing ships the current OEM replacement, which is a direct drop-in fit.

• Specs: 120V primary | 24V secondary | 40VA rating | 60 Hz single-phase | Foot-mount configuration | Wire lead connections with pre-installed insulated connectors
• OEM vs Generic: OEM transformers are wound to exact factory VA ratings and voltage tolerances. Undersized or off-spec generic units can starve the control board under peak load, causing nuisance lockouts or premature board failure — a repair far more costly than the transformer itself.
• Install Difficulty: 2/5 — Turn off power at the breaker and verify 0V with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all wire connections before disconnecting. Check for a blown 3A low-voltage fuse on the control board and replace it simultaneously if found.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8UAA024065ABJA packaged gas furnace and cross-references OEM part numbers HT01BC116, HT01BC116B, HT01BC115, HT680054, and several related Bryant/Payne transformer part numbers. Verify 120V primary input on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions.