OEM Carrier 40VA Control Transformer for Model G1RS050A12 — Part# HT01BC116

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier G1RS050A12 furnace. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, control board, and gas valve relay. When it fails, the entire control circuit goes dark: the thermostat displays nothing, the system won't respond to any call for heat or cooling, and in many cases the furnace appears completely dead. A failed transformer is one of the most misdiagnosed problems in HVAC service, often confused with a bad control board.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 insulated | Direct OEM replacement for part# HT01BC116
• OEM vs Generic: This OEM unit is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control-circuit load. Undersized or off-spec generic transformers can sag under load, causing intermittent lockouts and nuisance board faults.
• Install difficulty: 2/5 — Turn off power at the breaker and verify with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph existing wiring before disconnecting. Replace the inline fuse if one is present — a blown transformer often indicates a downstream short.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier G1RS050A12 furnace. Always verify your existing transformer's VA rating and primary/secondary voltages from the data plate or wiring diagram before ordering. If you're unsure of fitment, our parts team confirms compatibility before your order ships — same-day on all in-stock OEM parts.