OEM Carrier 40VA Control Transformer 120V/24V for Model GA1AAD060120ABJA

This OEM control circuit transformer (part number HT01BC116) is the factory-specified replacement for the Carrier GA1AAD060120ABJA gas furnace. The transformer steps down line voltage from 120V to the 24V AC signal used by the thermostat, control board, gas valve, and all low-voltage safety circuits. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system stops responding to calls for heat or cooling, and nothing happens when you adjust the temperature. A failed transformer is often misdiagnosed as a thermostat or control board failure, so always verify 24V output at the secondary terminals before replacing more expensive components.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched to Carrier OEM part HT01BC116
• OEM vs Generic: This OEM unit is wound to exact Carrier specifications, ensuring stable 24V output under full load. Generic transformers frequently underperform at rated VA, causing nuisance lockouts and premature control board failure due to voltage sag.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after installation. Label and photograph all low-voltage wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier GA1AAD060120ABJA gas furnace. Confirm your existing transformer's VA rating, primary voltage, and secondary voltage on the unit data plate or original part label before ordering. If you need help verifying fitment, our HVAC parts specialists confirm compatibility before your order ships — no guesswork.