Fujitsu AOUG09LZAS1, Service Manual

Page: 51 / 179

2-4. E: 18. External communication error (Indoor unit)
Indicator Indoor unit
Operation indicator 1 time flash
Timer indicator 8 time flash
Economy indicator Continuous flash
Error code E: 18
Detective actuator Indoor unit
External
communication
error After receiving a signal from the external input and
output PCB, the same signal has not been received for
15 seconds.
Forecast of cause
Connection failure
WLAN adapter failure
Main PCB
Check point 1. Check the connection
• Check any loose or removed connection between the main PCB to the WAN 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 WLAN adapter and the main PCB (If there is loose con-
nector, open cable or mis-wiring.)
↓
Check point 2. Replace the WLAN adapter
If check point 1 do not improve the symptom, change WLAN adapter.
↓
Check point 3. Replace main PCB
If check point 2 do not improve the symptom, change main PCB
↓
End
2-4. E: 18. External communication error (Indoor unit)
- (03-15) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING