OEM Carrier 40VA Control Transformer for Model GB1AAV060135AFJA

This is the factory OEM replacement control transformer (part# HT01BC116) for the Carrier GB1AAV060135AFJA gas furnace. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, gas valve, and control board. When the transformer fails, the entire control circuit goes dark: the thermostat goes blank, the system won't respond to any calls for heat or cooling, and the furnace will not attempt ignition. In some cases a failed transformer is preceded by a blown fuse on the control board, which is often a symptom of a short in the low-voltage wiring.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Factory-matched OEM part number HT01BC116 | Designed for Carrier GB1AAV060135AFJA gas furnace control circuit
• OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications for this furnace platform, ensuring stable 24V output under full control circuit load. Generic units may droop under load, causing intermittent lockouts and erratic thermostat behavior.
• Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage before touching any terminals. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Note wire colors before disconnecting. Replace the control board fuse if blown before restoring power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV060135AFJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages on the data plate or wiring diagram before ordering. If you need help confirming fitment, our parts specialists verify compatibility before you buy — no guesswork required.