OEM Carrier Control Transformer 40VA 120V/24V for Model GB1AAV036111AEJA

This OEM replacement control transformer (Part# HT01BC116) is the factory-specified unit for the Carrier GB1AAV036111AEJA packaged gas/electric system. The transformer steps down the 120V line voltage to the 24V AC signal required to power the control board, thermostat circuit, and all low-voltage control components. When this transformer fails, nothing in the system responds — the thermostat goes blank, the control board loses power, and the unit will not heat or cool under any call. A blown transformer is often caused by a short in the low-voltage wiring or a failed control board drawing excess current; always inspect downstream wiring before replacing.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM Part# HT01BC116 | Class 2 current-limiting design for built-in circuit protection
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Generic transformers may under-deliver VA capacity, causing nuisance lockouts or premature failure under full control-circuit load.
• Install difficulty: 2/5 — Shut off power at the disconnect before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output and check for downstream shorts), wire nuts or spade connectors. Photograph all wiring before disconnecting terminals.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier GB1AAV036111AEJA packaged unit. Verify primary voltage (120V) and VA rating (40VA) on your unit's wiring diagram or data plate before ordering. If your transformer shows burn marks or a tripped thermal fuse, inspect all 24V wiring for shorts prior to installation. Our parts specialists are available to confirm fitment — order with confidence and get back up and running today.