OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8DAA036095AAJA

This OEM control transformer is the factory-specified replacement for the Carrier PG8DAA036095AAJA gas furnace. It steps down 120V line voltage to the 24V DC signal that powers the thermostat, control board, gas valve, and every low-voltage circuit in your system. When this transformer fails, the furnace goes completely dead — no thermostat response, no ignition attempt, no fan activity. It is one of the most overlooked root causes of a furnace that appears to have total electrical failure. OEM part number HT01BC116 has been superseded; current OEM replacement is HT680054, which is the part supplied.

• Specs: 40VA rating | 120V primary | 24V secondary | Step-down design | Wire-lead connection type | Factory-matched output tolerance
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can cause erratic thermostat behavior, nuisance lockouts, and premature board failure — not worth the small savings.
• Install Difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all wire leads before disconnecting the old transformer. Swap leads one at a time to prevent miswiring.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8DAA036095AAJA gas furnace. Also compatible with Bryant and Payne units sharing the same transformer specification. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our fitment team is available to confirm compatibility before you purchase.