OEM Carrier 40VA Control Transformer for Model GB1AAV060155AGJA

This OEM replacement transformer (part number HT01CN001) is the factory-specified control circuit transformer for the Carrier GB1AAV060155AGJA gas furnace. The transformer steps down 120V line voltage to the 24V signal voltage required by the thermostat, control board, gas valve, and all low-voltage control components. When this part fails, the entire control circuit goes dead — the thermostat loses power, the furnace will not respond to any call for heat, and nothing operates. A failed transformer is often mistaken for a bad thermostat or control board, making this a smart first diagnostic step.

• Specs: 40VA rating | 120V primary / 24V secondary | Single-phase | Class 2 insulation | Foot-mount configuration | Direct OEM replacement for part number HT01CN001
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances required by the Carrier GB1AAV060155AGJA control board. Undersized or off-tolerance generic transformers can nuisance-trip on overload, damage downstream low-voltage components, or cause intermittent control failures over time.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, needle-nose pliers, multimeter (to confirm 24V output after install). Note wire colors and terminal positions before disconnecting the old unit. Job typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier GB1AAV060155AGJA gas furnace. Verify your existing transformer's VA rating and voltage markings on the data plate or component label before ordering to ensure a correct fit. If you're unsure, our parts team is available to confirm fitment before you buy — no guesswork required.