OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8UAA048135ADJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8UAA048135ADJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat circuit, control board, gas valve, and all low-voltage safety controls. When this transformer fails — whether from a shorted wire, a failed board drawing excess current, or simply age — the entire control circuit goes dead: the thermostat goes blank, the furnace won't respond to calls for heat, and nothing works. Replacing it is one of the fastest and most cost-effective furnace repairs available.

• Specs: 40VA Rating | 120V Primary / 24V Secondary | 50/60 Hz | Single Phase | Compact chassis-mount design (3" L × 2-2/16" W × 2" H)
• OEM vs Generic: This OEM unit is wound to exact factory VA and impedance tolerances, ensuring stable 24V output under all load conditions. Generic transformers often run hot under peak control-board demand, shortening lifespan and risking repeat failures.
• Install Difficulty: 2/5 — Shut off furnace power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always note wire colors before disconnecting. Check for shorted 24V wiring before installing the new transformer to avoid immediate re-failure.
• Warranty: 1-year OEM manufacturer warranty. In stock — ships same business day when ordered by 5 PM local time.

Compatibility: Designed for Carrier model PG8UAA048135ADJA gas furnace. OEM part number HT01BC116, superseded by current production part HT680054 — both are the same factory-spec transformer. Verify 120V primary / 24V secondary / 40VA rating on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy.