NOTE: In the SonicWall TZ Series appliances there are two Service LEDs, which are reserved to reflect "Services" in the future, however in current SonicOS versions, they are used to reflect presence of the Alarms.
The Test and Alarm LEDs illuminate yellow or red. These LEDs can blink, flash, heartbeat or show a solid light.
Blink is a repetitive rapid on/off cycle (on second, off second).
A flash is a single slow on/off cycle.
Heartbeat is a double flash, repetitive on/off cycle (on 1/15th second, off 1/6th second, on 1/15th second, off second).
Power is On.
Power Supply Not Functioning Correctly.
No AC Cable plugged in or On/Off switch at the back of the product is on 0.