# Description of LEDs

On the control print are three state LEDs:

LED | off | on | flash | state description
green | 0% |  |  | no supply voltage
|  |  | 90% | inverter not running
|  |  | 50% | hard fault; green & red alternate
|  |  | 10% | inverter running
red | 0% |  |  | no fault
|  |  | 50% | fault state
yellow | 0% |  |  | no SD card inserted
|  | 100% |  | access to SD card (short); SD card error (permanent)