OEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV060135ADJA

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB1AAV060135ADJA gas furnace. The transformer steps down incoming 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control system goes dark — the thermostat goes blank, no heating calls are processed, and the furnace will not fire under any condition. A failed transformer is often misdiagnosed as a bad control board, making it the smart first component to test and replace.

• Specs: 40VA rated | 120V primary / 24V secondary | Factory-matched OEM tolerances | Replaces OEM part number HT01BC116
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage specifications for the GB1AAV060135ADJA. Generic transformers may be under-rated in VA capacity, causing overheating, nuisance tripping of the internal fuse, and premature failure — especially under high control-circuit loads.
• Install difficulty: 2/5 — Disconnect power at the disconnect switch and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 0V at primary terminals before handling. Label or photograph all wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model GB1AAV060135ADJA gas furnaces. Always confirm your existing transformer's VA rating and primary/secondary voltage from the unit's data plate or wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before every order — contact us before you buy.