OEM Carrier Transformer 40VA 120V/24V for Model GB1AAV060111AEJA (HT01BC116)

This is the factory OEM replacement transformer (part number HT01BC116) for the Carrier GB1AAV060111AEJA gas furnace. The transformer is the heartbeat of your furnace's control circuit — it steps down line voltage (120V) to the 24V signal voltage that powers your thermostat, control board, gas valve, and all low-voltage components. When the transformer fails, the entire control circuit goes dark: the thermostat shows no response, the furnace won't initiate a heating cycle, and nothing happens when you adjust the setpoint. A failed transformer is often caused by a shorted low-voltage wire, a failed control board, or age-related winding degradation.

• Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BC116 | Factory-matched winding impedance and VA capacity for full control circuit load
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances specified by Carrier engineering. Undersized or off-tolerance generic units can cause erratic thermostat behavior, nuisance lockouts, or premature control board failure due to voltage sag under load.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Always check low-voltage wiring for shorts before installing the new transformer — a wiring short will blow the new unit immediately.
• Warranty: 1-year OEM factory warranty included. In-stock units ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV060111AEJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists will confirm compatibility before you buy — no guesswork required. Order today and get same-day shipping on all in-stock parts.