OEM Carrier 40VA Control Transformer HT01BC116 for Model GA2AAD036070ABJA

This is the OEM factory-specified control transformer for the Carrier GA2AAD036070ABJA packaged or split-system unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat displays nothing, the system won't respond to any call for heating or cooling, and downstream diagnostics become impossible until it's replaced. It is often the first component to inspect when nothing in the system responds.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BC116 | Factory-matched electrical tolerances for reliable low-voltage control circuit performance
• OEM vs Generic: This is the genuine Carrier OEM transformer, wound and rated to exact factory specifications. Generic alternatives frequently carry lower VA ratings or looser voltage tolerances, which can cause nuisance tripping of the control board fuse or premature contactor coil failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper, needle-nose pliers. Photograph all wiring connections before disconnecting. Primary and secondary leads are color-coded for straightforward reinstallation.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before our daily cutoff ship the same business day from our climate-controlled warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier GA2AAD036070ABJA. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy. In stock and ready to ship today.