OEM Carrier 40VA Control Transformer HT01BC116 for Model GB3AAV036050ADJA

This is the factory OEM replacement control transformer (part number HT01BC116) for the Carrier GB3AAV036050ADJA gas furnace. The transformer steps down 120V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat display goes blank, the furnace will not respond to any call for heat, and no safety or operating functions can execute. A failed transformer is often the first suspect when absolutely nothing in the system responds.

• Specs: 40VA rating | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01BC116 | Factory-matched output tolerance for stable low-voltage operation
• OEM vs Generic: This is a genuine Carrier OEM transformer, wound to exact factory VA and voltage specifications. Generic transformers may be under-rated in VA, causing brownouts on the 24V circuit under load — leading to erratic control board behavior and nuisance lockouts.
• Install difficulty: 2/5 — Disconnect power at the disconnect switch and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wiring). Photograph all wire connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier GB3AAV036050ADJA gas furnace. Always verify the transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on all in-stock OEM parts.