OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8MAA024045ACJA (HT01BC116 / HT680054)

This is the OEM factory-specified control transformer for the Carrier PG8MAA024045ACJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, gas valve, control board, and every other low-voltage component in the system. When it fails—due to a shorted low-voltage circuit, a blown internal fuse, or simple age—nothing in the furnace will respond: no call for heat, no blower, no ignition sequence whatsoever. Replacing it is one of the most reliable and cost-effective repairs in HVAC service.

• Specs: Primary input 120V AC | Secondary output 24V AC | 40VA rated | 60 Hz | Foot-mount bracket | Wire-lead connections | OEM part HT01BC116 (current superseding OEM part: HT680054)
• OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, ensuring the 24V output stays stable under full control-circuit load. Generic units frequently run outside spec, causing erratic thermostat behavior, nuisance lockouts, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (verify 0V before touching terminals), needle-nose pliers. Photograph all wire connections before removing the old transformer. Check and replace the in-line 3A fuse if present—a blown fuse indicates a low-voltage short that must be resolved before installing the new transformer.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier model PG8MAA024045ACJA gas furnace. Also fits a wide range of Carrier, Bryant, and Payne furnaces specifying HT01BC116 or its successor HT680054. Verify 120V primary input and 24V/40VA output on your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts team checks compatibility before you buy — just ask.