OEM Carrier 40VA Control Transformer for Model GA2AAD060090AAJA

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GA2AAD060090AAJA 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 it fails, nothing in the system responds — the thermostat goes dark, the furnace won't initiate a heating cycle, and the control board receives no power. A blown transformer is often the result of a short in the 24V circuit, so always inspect low-voltage wiring before installing the replacement.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 insulation | Factory-matched to Carrier OEM specification | OEM Part# HT01BC116
• OEM vs Generic: OEM transformers are wound and rated to exact factory tolerances, ensuring stable 24V output under full control circuit load. Generic units may sag under load, causing intermittent lockouts and erratic thermostat behavior.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install and to locate any downstream short). Label all wire connections before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GA2AAD060090AAJA gas furnace. Verify existing transformer VA rating and voltage on your unit's data plate before ordering. If you are unsure of fitment or need help confirming the downstream short before replacing, our HVAC parts specialists are available to verify compatibility before you order — same-day shipping guaranteed on in-stock parts.