Fujitsu ASYG12KGTE Service Manual page 43

2-3. E: 18. External communication error (Indoor unit)
Indicator Indoor unit
Detective actuator Indoor unit
Forecast of cause
Check point 1. Check the connection
• Check any loose or removed connection between the main PCB to the →AN adapter.
-> If there is an abnormal condition, correct it by refer to the installation manual or the "DESIGN
& TECHNICAL MANUAL".
• Check the connection condition on the →LAN adapter and the main PCB (If there is loose con-
nector, open cable or mis-wiring.)
Check point 2. Replace the →LAN adapter
If check point 1 do not improve the symptom, change →LAN adapter.
Check point 3. Replace main PCB
If check point 2 do not improve the symptom, change main PCB
2-3. E: 18. External communication error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
External
communication
error
End
Continuous flash
After receiving a signal from the external input and
output PCB, the same signal has not been received for
15 seconds.
Connection failure
→LAN adapter failure
- (03-7) -
1 time flash
8 time flash
E: 18
Main PCB
2. Troubleshooting with error code