OEM Carrier Furnace Transformer 40VA 120V–24V for Model PG9MAA060100AAKA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAA060100AAKA gas furnace. It converts 120V line voltage to 24V AC to power all low-voltage control circuits — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, nothing in the furnace responds: the thermostat calls for heat but the system stays completely dead, or you may find a blown 3A fuse on the control board as a secondary symptom of transformer overload.

• Specs: 40VA rating | 120V primary | 24V secondary | 60 Hz | Single phase | Foot-mount configuration | Wire lead connections with insulated female quick-connect terminals
• OEM Part Numbers: HT01BC116 (original) / HT680054 (current OEM successor). This is a direct OEM factory replacement — not a generic substitute. Meets all original Carrier factory tolerances and is supplied in a factory-authorized parts box.
• Install Difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire connections before removal. Discharge any stored voltage and confirm the 3A fuse is intact before replacing the transformer alone.
• Warranty: 1-year OEM manufacturer warranty from date of purchase. In-stock units ship same business day when ordered before cutoff. Fast delivery to get your furnace back online quickly.

Compatibility: Designed for the Carrier PG9MAA060100AAKA gas furnace. This OEM transformer also serves a broad range of Carrier, Bryant, and Payne furnaces requiring a 40VA 120V–24V step-down transformer — see the compatibility note below and verify against your unit's data plate. Questions about fitment? Our parts team verifies compatibility before you order — reach out before you buy.