OEM Carrier Transformer 40VA 120V to 24V for Model GA1AAD036050AAJA

This OEM control circuit transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GA1AAD036050AAJA packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and every other low-voltage control component in the system. When it fails, absolutely nothing works — the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may find a blown fuse on the control board from a secondary-side short. This is one of the first components to check during a no-power, no-communication diagnostic.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Direct OEM replacement for part number HT01BC116
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can cause nuisance tripping, blown fuses, and premature control board failure — costing far more than the transformer itself.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all wire connections before removal. The transformer mounts to the control panel with two screws and uses push-on or screw terminals.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GA1AAD036050AAJA packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists will confirm compatibility before you buy — no guesswork required.