OEM Carrier Transformer 40VA 120V/24V for Model GB1AAV024065ADJA

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier GB1AAV024065ADJA air handler. The transformer steps down 120V line voltage to the 24V signal voltage required to power your thermostat, control board, relays, and zone controls. When this component fails, the entire low-voltage control circuit goes dead — your thermostat displays nothing, the system won't respond to calls for heating or cooling, and no staging or safety functions operate. It is often the first component to inspect when a system appears completely unresponsive despite the disconnect being on.

• Specs: 40VA rating | 120V primary input | 24V secondary output | Class 2 transformer | Factory-matched to Carrier OEM control board requirements | OEM Part Number: HT01BC116
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic units can cause nuisance tripping, brownouts on the control circuit, and premature board failure — making OEM the only recommended choice for this application.
• Install difficulty: 2/5 — Disconnect power at the breaker and indoor disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify secondary voltage output (should read 24–28V AC) before buttoning up the unit. Label or photograph existing wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: This transformer is designed for the Carrier GB1AAV024065ADJA air handler. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage from the data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before your purchase. Order today and receive same-day shipping on all in-stock OEM parts.