OEM Carrier Control Transformer 120V–24V 40VA for Model PG8JAA048090ABJA

This OEM Carrier step-down transformer is the factory-specified control circuit replacement for the Carrier PG8JAA048090ABJA gas furnace. The transformer converts 120V line voltage down to the 24V signal voltage required to power the thermostat circuit, control board, gas valve, and all low-voltage components. When this part fails, the entire control circuit goes dark — nothing responds: no ignition sequence, no fan, no thermostat communication. It is often the first component to diagnose when your furnace appears completely dead with no error codes displayed.

• Specs: 120V primary | 24V secondary | 40VA rated | Wire lead connections | Drop-in OEM fit for Carrier PG8JAA048090ABJA | Replaces OEM part# HT01BC116 (current replacement: HT680054)
• OEM vs Generic: This OEM transformer is wound and rated to exact Carrier factory tolerances. Generic transformers frequently run outside rated VA capacity under real load conditions, risking control board damage and repeat failures.
• Install Difficulty: 2/5 — Shut off all power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire connections before disconnecting. This is a straightforward swap accessible at the furnace control panel.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG8JAA048090ABJA 80% AFUE packaged gas furnace. Always verify primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. If you are unsure of fitment, our HVAC parts specialists will confirm compatibility before you purchase — same-day shipping available on all in-stock orders.