OEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV060111ABJA

This OEM replacement transformer (part # HT01BC116) is the factory-specified control circuit transformer for the Carrier GB1AAV060111ABJA gas furnace. Its job is to step down line voltage from 120V to the 24V signal that powers your thermostat, control board, gas valve, and every other low-voltage component in the system. When this transformer fails, absolutely nothing works — the thermostat goes dark, the furnace will not respond to any call for heat, and you may measure 0V AC at the R and C terminals of the control board. Replacing the transformer is one of the most cost-effective repairs in HVAC service.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Direct factory replacement with correct mounting footprint and lead configuration
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic transformers can brown out under load, causing nuisance lockouts or premature board failure — the OEM unit is the only reliable long-term fix.
• Install difficulty: 2/5 — Shut off power at the breaker and confirm 0V with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or spade terminals. Label or photograph all wire connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty against defects. Orders received before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier GB1AAV060111ABJA gas furnaces using OEM part number HT01BC116. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or old transformer label before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions.