OEM Carrier 40VA Control Transformer for Model GB3AAV060115ADJA

This is the factory OEM replacement control transformer (part# HT01BC116) for the Carrier GB3AAV060115ADJA gas furnace. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage control circuits. When the transformer fails, absolutely nothing responds — the thermostat goes blank, the furnace won't attempt ignition, and the entire control circuit goes dark. A blown transformer is often caused by a wiring short downstream, so inspect low-voltage wiring before installing the replacement.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Compatible with standard low-voltage HVAC control circuits | OEM part number HT01BC116
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can overheat, nuisance-trip, or cause erratic thermostat behavior — especially during peak heating demand.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output on the new transformer before closing the cabinet. Check for downstream shorts before energizing.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB3AAV060115ADJA 60,000–115,000 BTU gas furnace. Verify OEM part number HT01BC116 on your existing transformer's label before ordering. If you're unsure about fitment, our HVAC parts team will confirm compatibility before your order ships — no guesswork required.