OEM Carrier Transformer 40VA 120V to 24V for Model GA1AAD024050ABJA

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier GA1AAD024050ABJA packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage safety controls. When the transformer fails, the entire control circuit goes dark — your thermostat will display nothing or fail to communicate, and the system will not respond to any heating or cooling calls. A blown transformer is often caused by a short in the low-voltage wiring or a failed component drawing excess current; always inspect the secondary circuit before installing a replacement.

• Specs: Input 120V AC | Output 24V AC | 40VA rating | OEM part number HT01BC116 | Factory-matched for the Carrier GA1AAD024050ABJA control circuit
• OEM vs Generic: This OEM transformer is wound and insulated to Carrier's exact VA and voltage specifications. Generic transformers may carry looser VA tolerances, risking under-voltage conditions that cause erratic board behavior or premature contactor coil failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring before disconnecting, and always check for low-voltage shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model GA1AAD024050ABJA. Confirm your unit's data plate lists a 120V primary / 24V secondary, 40VA control transformer before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online today.