OEM Carrier 40VA Control Transformer for Model GB3AAV036095AEJA — Part# HT01BC116

This is the genuine OEM replacement control transformer (part# HT01BC116) for the Carrier GB3AAV036095AEJA gas furnace. The transformer steps line voltage (120V) down to the 24V low-voltage signal required to power your thermostat, control board, gas valve, and all safety circuits. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heat or cooling, and nothing works. A failed transformer is often misdiagnosed as a bad thermostat or control board, making this an important first diagnostic step.

• Specs: 40VA output rating | 120V primary / 24V secondary | Factory-matched impedance and thermal protection | Direct OEM replacement for part# HT01BC116
• OEM vs Generic: The OEM HT01BC116 transformer is wound to exact factory VA ratings and includes internal thermal overload protection. Generic transformers often underrate their VA capacity, causing overheating and premature failure — especially when multiple 24V accessories are on the circuit.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect the furnace before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or quick-connect terminals, and a multimeter to confirm 24V output after installation. Always verify primary and secondary voltages match your unit's wiring diagram.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock units ship same business day when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier GB3AAV036095AEJA gas furnace. Always verify the existing transformer's primary/secondary voltage ratings and VA rating on the data plate or wiring diagram before ordering to ensure a proper fit. If you have questions about fitment, our HVAC parts specialists will confirm compatibility before you order — same-day shipping available on all in-stock parts.