Short Terminal 10 (Earth Ground) to Terminal 9 (Command) for 30 Seconds and the keypad should display Ground Fault.
If not check the following:
Switch S4 Ground Fault Detect Switch (Below Terminal 10) is Close/Enabled
Programming any non zero value in Area 5’s Silent Alarm Relay will enable Ground Fault Detect on D9412G or D7412G Control/Communicators.
Part numbers D9124G, D9124GV2, D7412G, D9412G, D7412GV2, D9412GV2, D7412GV3, D9412GV3, D7412GV4, D9412GV4,
Programming Prompts 9000Main; Relay Parameter; Area Wide Relays; Area 5; Silent Alarm Relay Enter Any Non Zero Value.