OEM Carrier 40VA Control Transformer for Model GB3AAV060115ABJA

This is the OEM factory-replacement control transformer (part # HT01BC116) for the Carrier GB3AAV060115ABJA 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 safety circuits. When it fails, nothing in the control circuit responds — the thermostat goes blank, the furnace won't ignite, and the system appears completely dead even with power present. A blown transformer is often caused by a shorted wire in the low-voltage circuit, so always inspect the 24V wiring before installing a replacement.

• Specs: 40VA rated | 120V primary → 24V secondary | Class 2 transformer | OEM part number HT01BC116 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM unit is wound to Carrier's exact VA and voltage tolerances, ensuring stable 24V output under full load. Undersized or off-tolerance generic transformers can overheat, blow fuses, or cause erratic control board behavior.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install and to check for shorts in low-voltage wiring). Always identify and correct any short circuit in the thermostat wiring before powering up the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier GB3AAV060115ABJA gas furnaces using the HT01BC116 transformer. Verify your existing transformer's VA rating and part number against your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on all in-stock orders.