Troubleshooting 76 - Error Contents: Communication Error With Indoor Unit - Fujitsu Airstage V series Service Manual

Trouble shooting 76
Error Contents :
Communication Error
with Indoor Unit
Details :
Condition of occurrence : The communication between Indoor unit and Network Convertor was not performed normally.
Release condition : When the communication with Indoor unit is resumed normally.
Cause 1 : External noise
p After pressing SW104 of Network Converter PCB for 5 seconds or turning on power.
Does error code display reappear?
YES
Remove the surrounding noise source.
OK
Cause 2 :
Defective or open connection of Remote Control cable between Network Convertor and Indoor Unit.
After the following are checked, the power supply is reset.
p Check connection cable wire between Network Convertor and Indoor unit.
p Check connection between Control PCB and Terminal.
OK
Cause 3 : Power to Indoor unit is shut down.
p Check the power to Indoor unit.
OK
Cause 4 : Incorrect setting of main unit address of Indoor unit.
p Check main unit address setting of Indoor unit.
OK
Cause 5 : Incorrect setting of DIP-SW of Network Convertor. Mis-read of Indoor unit type and RC type.
p Check DIP-SW103[1 to 8] of Network Convertor (Indoor unit type, RC type, number of Indoor units connected.)
p Check Indoor unit type and RC type of all Indoor units connected to Network Convertor.
OK
Cause 6 : Defective PCB of Indoor unit or Network Convertor.
Replace PCB of Indoor unit or Network Convertor.
Symptom :
Error Code display [ 1C ]
All the control items do not operate.
NO
It is not a defect of PCB. Remove the surrounding noise source.
06-76