Fujitsu Airstage J-II Service Manual page 139

4. Group Remote Controller (UTY-CGGY / CGGG)
Trouble shooting 76
Error Contents :
PCB Error
Details :
Condition of occurrence : When EEPROM can not be written, or the control port does not operate.
Release condition : Power is reset.
Cause 1 : Remote Controller is defective.
Replace Group Remote Controller.
Symptom :
Error Code display [ C 4 ]
OPERATION LED is flashing.
04-76