OEM Carrier Transformer 40VA 120V/24V for Model GB1AAV036045ACJA

This OEM control circuit transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB1AAV036045ACJA gas furnace. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat, gas valve, and all low-voltage components. When it fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to calls for heat or cooling, and nothing works. A failed transformer is often the first thing an HVAC technician checks when a system is completely unresponsive.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM part# HT01BC116 | Direct plug-in or wire-in mount compatible with furnace control board bracket
• OEM vs Generic: This is the exact factory OEM transformer. Generic units may carry insufficient VA ratings or use lower-grade core materials, leading to overheating and premature failure — especially in systems with multiple 24V accessories such as humidifiers or zone boards.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect the furnace before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections prior to removal. Verify 24V output with a multimeter after installation before closing the cabinet.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed as a direct OEM replacement for the Carrier GB1AAV036045ACJA gas furnace. Confirm your existing transformer's VA rating and primary/secondary voltage on the unit's data plate or wiring diagram before ordering. Our parts specialists are available to verify fitment — order with confidence and get back to comfort fast.