OEM Carrier Transformer 120V–24V 40VA for Model PG9MAB024060AASA

This OEM step-down transformer (part number HT01BC116) is the factory-specified replacement for the Carrier PG9MAB024060AASA gas furnace. The transformer converts 120V line voltage to the 24V AC signal that powers your furnace's entire control circuit — including the thermostat, IFC board, gas valve, and zone controls. When this component fails, the furnace will appear completely unresponsive: no blower, no ignition attempt, and no thermostat communication. A failed transformer is often misdiagnosed as a bad control board, so always test transformer output voltage before replacing the board.

• Specs: Primary: 120V AC | Secondary: 24V AC | 40VA rated | Factory-matched OEM build quality | Spade or screw terminal connections
• OEM vs Generic: OEM transformers (HT01BC116) are wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full load. Generic units may under-deliver current at peak demand, causing nuisance lockouts and premature IFC board failure.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify 0V at the transformer primary before touching any wires. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Always verify secondary output voltage (should read ~24–28V AC) after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PG9MAB024060AASA gas furnace. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) on its label before ordering. If your control voltage is reading low or absent, test the transformer first — it is one of the most cost-effective repairs in the furnace control circuit. Questions about fitment? Our HVAC parts specialists verify compatibility before you order.