OEM Carrier 40VA Control Transformer HT01BC116 for Model GB3AAV048095AFJA

This is the OEM factory-replacement control transformer (part# HT01BC116) for the Carrier GB3AAV048095AFJA gas furnace. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage control circuits. When this component fails, the entire control system goes dark — your thermostat loses power, the furnace will not respond to any call for heat or cooling, and no status LED codes will appear on the control board. A failed transformer is often misdiagnosed as a bad control board, making this an important first diagnostic step.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can cause nuisance lockouts, brownouts on the 24V circuit, and premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is off with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before removal. Typical replacement time: 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier GB3AAV048095AFJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. If you're unsure about fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all in-stock orders.