OEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model GB1AAV024045AEJA

This OEM replacement transformer (part# HT01BC116) is the factory-specified control circuit transformer for the Carrier GB1AAV024045AEJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required to power the thermostat circuit, control board, gas valve, and all low-voltage system controls. When this transformer fails, the entire control circuit loses power — the thermostat goes dark, the system will not respond to any call for heat or cooling, and no components will energize. A failed transformer is one of the most commonly misdiagnosed furnace problems, often mistaken for a bad thermostat or control board.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | Replaces OEM part number HT01BC116 | Factory-matched output tolerance for reliable low-voltage control
• OEM vs Generic: This is a genuine OEM Carrier transformer built to exact factory VA and voltage specifications. Generic transformers with underrated VA capacity can overheat under full system load, tripping the internal thermal fuse and causing intermittent or repeated failures.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for output verification. Label all low-voltage wires before disconnecting from secondary terminals. Confirm 24V output before reassembling the cabinet.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV024045AEJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate or component label before ordering. If you're unsure of fitment, our parts specialists are available to confirm compatibility before you place your order — same-day shipping available on all in-stock OEM parts.