OEM Carrier Furnace Control Transformer 40VA 120V/24V for Model PG8MAA060090ADJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8MAA060090ADJA gas furnace. The control transformer converts 120V line voltage down to 24V AC, powering the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and IFC control board. When this transformer fails, the furnace goes completely dark: no thermostat response, no inducer startup, no ignition attempt. It is often the first component to check when nothing on the furnace appears to respond.

• Specs: 40VA rating | 120V primary (input) | 24V secondary (output) | 60 Hz single-phase | Foot-mount configuration | Wire lead connections with insulated female quick-connect terminals
• OEM vs Generic: This OEM unit is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic transformers frequently sag under load, causing intermittent lockouts and nuisance board faults that are difficult to diagnose.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching terminals). Photograph existing wiring before disconnecting leads. Note: check for a shorted low-voltage wire before installing — a short is the #1 cause of transformer burnout.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PG8MAA060090ADJA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are covered by this listing. Cross-references include HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, and additional Carrier/Bryant/Payne variants. Always verify your unit's data plate voltage requirements before ordering. Our team is available to confirm fitment before you buy.