Endress+Hauser Proline Promass E 500 PROFINET Operating Instructions Manual page 180

Diagnostics and troubleshooting
180
LED
1 Communication
2 Device status (normal
operation)
2 Device status (during
start-up)
3 Supply voltage
Color Meaning
White Communication active.
Red Problem
Flashing red Warning
Flashes red slowly If > 30 seconds: problem with the boot loader.
Flashes red quickly If > 30 seconds: compatibility problem when
reading the firmware.
Green Supply voltage is ok.
Off Supply voltage is off or too low.
Proline Promass E 500 PROFINET
Endress+Hauser