OEM Carrier Control Transformer 40VA for Model GB1AAV036045AEJA

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier GB1AAV036045AEJA gas furnace. The transformer steps down line voltage (120V) to the 24V AC signal that powers the entire control circuit — including the thermostat, gas valve, contactor, and control board. When this component fails, the result is a completely unresponsive system: the thermostat goes dark, no heating cycle initiates, and no error codes are produced because the control board itself has no power. If your system is completely dead with no response at the thermostat, a failed transformer is the first component to test.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 control circuit transformer | OEM part number HT01BC116 | Factory-matched output tolerance for reliable control signal
• OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact VA and voltage specifications. Generic transformers can under-deliver on VA capacity, causing nuisance tripping of the built-in thermal fuse or undervoltage faults at the gas valve and control board — leading to repeat service calls.
• Install Difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all wiring connections before removal. The transformer mounts to the furnace cabinet with a single screw and reconnects via quick-connect or screw terminals.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier GB1AAV036045AEJA gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages on the data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — ships today, so your system is back online fast.