OEM Carrier Transformer 40VA 120V to 24V for Model GB1AAV048111AEJA

This is the factory OEM replacement transformer (part number HT01BC116) for the Carrier GB1AAV048111AEJA packaged gas/electric unit. The transformer is the backbone of your system's low-voltage control circuit — it steps incoming 120V line voltage down to the 24V signal voltage required by your thermostat, contactor coil, gas valve, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the contactor won't pull in, and the unit sits completely dead despite power being present at the disconnect. This is often misdiagnosed as a control board failure, making the transformer one of the first components to check.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BC116 | Factory-matched windings and thermal overload protection
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact VA and voltage tolerances required by the Carrier GB1AAV048111AEJA control circuit. Undersized or off-tolerance generic transformers can overheat, trip their internal breaker repeatedly, or fail to supply adequate current to multiple 24V loads simultaneously.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label all low-voltage wires before disconnecting. Verify 24V output with a multimeter after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV048111AEJA packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the data plate or wiring diagram inside the unit panel before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping means your repair stays on schedule.