Generac standby generators use LED lights to indicate operating status. The lights, visible through a translucent lens on the side of the generator, change color or flash to show whether the unit is ready, running under load, needs routine maintenance, or requires service.
For Guardian Series generators (2017–present), see here.
Guardian series generator LEDs
Green(A): “Ready” status. Illuminates when utility power is present and the unit is in AUTO. Flashes during an outage when the unit is running.
Red(B): “Alarm” status. Illuminates when the generator is OFF or a shutdown alarm is detected. Most alarm codes require an authorized service dealer. See the How Can I Find a Generac Service Dealer in My Area? article.
Four LEDs are visible behind a translucent lens on the generator side panel. These LEDs indicate generator operating status.
Note: For detailed information on the meaning of an LED indicator, and to check the generator's current status, reference the Mobile Link app or the Mobile Link website.
Green
The Green LED “Ready” light (A) illuminates when utility is present and the control panel is in AUTO. It flashes in one-second intervals when the automatic transfer switch converts to generator power during a utility outage, and in two-second intervals if utility power is lost and the unit is in the delay timer period before cranking/starting.
Yellow
The Yellow LED “MANUAL” or “Non-critical alert” light (C) illuminates when the control panel is in MANUAL and the unit is running. It flashes in one-second intervals when a warning is active or maintenance is required. If flashing, the generator should still run during an outage, but the alert should be addressed promptly. To see which alert is active, reference the Mobile Link app or the Mobile Link website. The Yellow LED may be illuminated at the same time as either the Red or Green LED.
The Red LED “Alarm” light (B) illuminates when the generator is OFF. It flashes in one-second intervals when a fault is detected. If the Red LED is illuminated, service from a Generac dealer may be required: What Error Codes Do I Need to Call a Dealer For?
The Blue LED “Service Mode” light (D) illuminates when the control panel is in SERVICE mode.
Note: The Blue LED may be illuminated at the same time as any other LED.
Troubleshooting
Owners should reference the Mobile Link app or the Mobile Link website for detailed LED meanings and current generator status. The LEDs work in tandem with the control panel and Mobile Link to indicate what needs attention.
