Fujitsu Airstage J-II, Service Manual

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Indoor / Outdoor Unit Error
Error Code display [ 5 U ]
Other controls are left as they are.
Condition of occurrence : When error occurred on Indoor/Outdoor unit that is connected to Network Convertor.
Release condition : When the error of Indoor/Outdoor unit that is connected to Network Convertor is released.
Cause 1 : Error occurred in Indoor unit
Refer to Indoor Unit trouble shooting.
(Removal of error of indoor unit connected to network converter)
Cause 2 : Error occurred in Outdoor unit
Refer to Outdoor Unit trouble shooting.
(Removal of error of outdoor unit connected to network converter)
Software Error
Error Code display [ C A ]
All the control items do not operate.
Other Controls are left they are.
Details :
Condition of occurrence : Micon program performed an abnormal control.
Error of inside information of EEPROM.
initial setting of Network Converor PCB was not normally performed.
Release condition : Micon has been reset, and the control of Network Convertor became normal.
When error disappeared and Network Convetor becomes available to control.
Cause 1 : External noise
Check continuation of error.
(1) If error is released automatically, it is not a defect of PCB. Remove the surrounding noise source around Network Convertor.
(2) If error is not released automatically, check followings.
After pressing SW104 of Network Convertor PCB for 5 seconds or turning on power.
Does error code display reappear?
OK
YES
OK
It is not a defect of PCB. Remove the surrounding noise source. Remove the surrounding noise source.
Cause 2 : Network Convertor is defective.
Replace Network Convertor.
04-75
Error Contents :
Symptom :
Trouble shooting 74
Error Contents :
Symptom :
Trouble shooting 75
OK
NO
Details :