OEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV036111ACJA

This is the factory OEM replacement transformer (part # HT01BC116) for the Carrier GB1AAV036111ACJA gas furnace. The transformer is the heart of the low-voltage control circuit — it steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all safety relays. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the furnace won't fire, and no error codes display because the board itself has no power. If you've confirmed 120V input at the transformer primary but zero voltage on the secondary, this is your part.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched for Carrier GB1AAV036111ACJA
• OEM vs Generic: This OEM transformer is wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can cause nuisance tripping of the board's 3-amp fuse, intermittent lockouts, or premature control board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching wiring). Label or photograph all wire connections prior to removal. The transformer mounts to the furnace cabinet with a single bracket screw and uses push-on spade terminals for quick, secure reconnection.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV036111ACJA gas furnace platform. Always verify the OEM part number HT01BC116 against your unit's wiring diagram or data label before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions. In stock and ready to ship today.