OEM Carrier Transformer 40VA 120V to 24V for Model GB1AAV060135AEJA

This OEM control circuit transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB1AAV060135AEJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage safety circuits. When it fails, the entire control system goes dark — the thermostat loses power, the furnace won't respond to any call for heat or cooling, and nothing works. A failed transformer is often misdiagnosed as a bad control board, so always test transformer output voltage before replacing more expensive components.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched impedance and inrush tolerance | Designed for continuous duty in Carrier furnace applications
• OEM vs Generic: OEM transformers like this HT01BC116 are wound to Carrier's exact VA and voltage specifications. Generic units frequently run under-rated VA, causing them to overheat under full low-voltage load — leading to premature failure and potential nuisance tripping of the built-in thermal fuse.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect the furnace before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wiring connections before disconnecting. The transformer mounts to the furnace cabinet or control board bracket with one or two screws.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier GB1AAV060135AEJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. If you're unsure of fitment, our HVAC parts team can verify compatibility before you purchase — no guesswork required.