OEM Carrier 40VA Control Transformer HT01BC116 for Model GB3AAV024050ADJA

This is the factory OEM replacement control transformer (part# HT01BC116) for the Carrier GB3AAV024050ADJA air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, nothing responds — the thermostat goes dark, the blower won't engage, and the system appears completely dead even with power at the unit. It is one of the first components to check during a no-response diagnosis.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM windings | Meets original equipment electrical tolerances for the GB3AAV024050ADJA air handler
• OEM vs Generic: The OEM HT01BC116 transformer is wound to Carrier's exact VA rating and insulation class, ensuring the control board and thermostat receive stable, clean 24V power. Generic transformers often run under-rated VA, causing voltage sag that triggers nuisance lockouts and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify secondary voltage output (should read 24–28V AC) after installation before closing the panel. Always confirm the primary circuit is de-energized first.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB3AAV024050ADJA air handler. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If your system uses a high-demand accessory load (humidifier, UV light, zone board), confirm total VA draw does not exceed 40VA. Our HVAC parts specialists are available to confirm fitment before you order — don't guess on control circuit components.