OEM Carrier 40VA Control Transformer for Model GB3AAV036095AGJA

This OEM Carrier control transformer (part number HT01BC116) is the factory-specified replacement for the GB3AAV036095AGJA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When this part fails, the system goes completely silent: the thermostat loses power, no call for heat is processed, and the furnace will not attempt to start. A blown transformer is often caused by a short in the 24V wiring or a failed component drawing excess current — always inspect the circuit before replacing.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | OEM part number HT01BC116 | Factory-matched output for stable control voltage
• OEM vs Generic: This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring full current capacity under sustained load. Generic transformers frequently underperform at rated VA, causing nuisance lockouts and premature control board failure due to voltage sag.
• Install difficulty: 2/5 — Disconnect power at the breaker and confirm voltage is absent before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections prior to removal. Secure all wire nuts firmly on reassembly.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our HVAC parts warehouse.

Compatibility: Designed for the Carrier GB3AAV036095AGJA gas furnace. Verify your existing transformer's VA rating and primary/secondary voltage on the data plate or wiring diagram before ordering. If you have questions about fitment, our parts specialists confirm compatibility before your order ships — no guesswork required.