OEM Carrier 40VA Control Transformer HT01BC116 for Model GA1AAD024065ACJA

This OEM control transformer is the factory-specified replacement for the Carrier GA1AAD024065ACJA air handler. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the entire system goes silent: the thermostat goes blank, nothing responds to a call for heating or cooling, and you may find a blown fuse on the control board from a secondary-side short. Part number HT01BC116 is the direct OEM replacement sourced from Carrier's factory supply chain.

• Specs: 120V primary | 24V secondary | 40VA rating | Factory-matched impedance and thermal protection | Ring-style or chassis-mount form factor per OEM design
• OEM vs Generic: OEM transformers like HT01BC116 are wound and insulated to exact factory tolerances, ensuring stable 24V output under full control-circuit load. Generic units often deliver inconsistent secondary voltage, causing intermittent lockouts, nuisance tripped fuses, or premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before starting. Tools needed: flathead and Phillips screwdriver, multimeter, wire stripper. Photograph all wiring connections before removing the old transformer. Check and replace the 3A or 5A control fuse if blown before restoring power.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day from our warehouse.

Compatibility: Designed for the Carrier GA1AAD024065ACJA air handler. Always verify primary voltage, secondary voltage (24V), and VA rating on your unit's wiring diagram or data plate before ordering. If you're unsure of fitment, our HVAC parts specialists can verify compatibility before you buy — same-day shipping on all stocked parts.