OEM Carrier 40VA Control Transformer for Model GB1AAV060155ADJA

This is the factory OEM replacement transformer (part number HT01BC116) designed specifically for the Carrier GB1AAV060155ADJA gas furnace. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, gas valve, and all low-voltage control circuit components. When the transformer fails, nothing in the control circuit operates — the thermostat goes dark, the furnace won't respond to any call for heat, and a multimeter check at the secondary terminals will show zero or significantly reduced voltage output.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Direct OEM replacement | Factory part number HT01BC116 | Screw-terminal or quick-connect leads (match your existing wiring)
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control circuit. Undersized or off-tolerance generic transformers can cause nuisance tripping, brown-outs on the 24V circuit, or premature control board failure — making the OEM the safer long-term investment.
• Install difficulty: 2/5 — Shut off all power to the furnace at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Confirm 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: This transformer is the factory-specified replacement for the Carrier GB1AAV060155ADJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's wiring diagram before ordering. Need fitment help? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.