Go to menu E. Sub menu 1 and hit enter. It then lists fault codes. Up and down to go through them. F1 is newest. On a fault code that has a subcode hit enter and it scrolls the subcode across the screen. Go back to menu E, sub menu 2 and hit enter, change value from 0 to 1 and hit enter again to clear all faults. Also note the status of everything as it was when the fault happened changes on the LEDS when you view the faults. So for instance if you wanted to know if you had a start permit or the status of the doors or something when a fault happened, the LEDS will show you how it was when it faulted.