OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8DAA036070ACJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8DAA036070ACJA gas furnace. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, gas valve, ignition board, and safety switches. When the transformer fails, the entire control circuit goes dead: your furnace won't respond to the thermostat, the board shows no indicators, and you'll measure 0V at the 24V secondary terminals. Replacing the transformer is often the fastest and least expensive fix for a completely unresponsive furnace.

• Specs: Primary voltage: 120VAC | Secondary voltage: 24VAC | VA rating: 40VA | Frequency: 60 Hz | Connection type: wire leads | Mounting: foot-mount | Includes built-in 3A fuse protection
• OEM vs Generic: This OEM unit is wound and tolerance-tested to Carrier's factory specifications. Generic transformers frequently deviate in VA output, causing erratic board behavior, nuisance lockouts, or premature failure of the control board — an expensive downstream consequence of a cheap transformer.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Label all wire connections before removal. The transformer mounts via foot bracket — swap leads one at a time to avoid miswiring the low-voltage circuit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8DAA036070ACJA gas furnace. OEM part number HT01BC116; superseded by factory replacement part HT680054 — both are covered by this listing. Confirm your unit's control board input voltage (120V) and VA requirement (40VA) on the data plate before ordering. Our team is available to verify fitment — just reach out before you buy.