OEM Carrier Transformer 40VA 120V to 24V for Model GB3AAV036050ACJA

This OEM replacement transformer (part number HT01BC116) is the factory-specified 40VA step-down transformer for the Carrier GB3AAV036050ACJA gas furnace. The transformer converts 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — your thermostat goes blank, no relays click, and the system is completely unresponsive. A blown transformer is often caused by a short in the 24V wiring or a shorted contactor coil, so always inspect the low-voltage wiring before installing a replacement.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BC116 | Factory-matched for Carrier GB3AAV036050ACJA control circuit requirements
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip internal thermal protection, and leave you chasing a repeat failure — the OEM unit eliminates that risk.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is off with a multimeter before proceeding. Tools needed: Phillips and flathead screwdrivers, wire stripper, multimeter, wire nuts. Label all wire connections before removal. The transformer typically mounts to the blower compartment panel with two screws and connects via spade or wire-nut terminals.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered specifically for the Carrier GB3AAV036050ACJA 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 of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping available on all stocked OEM parts.