E: 18.↓. External Communication Error (Indoor Unit) - Fujitsu ASUH18LMAS Service Manual

2-4. E: 18.X. External communication error (Indoor unit)
Indoor unit
Indicator
outdoor 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
2-4. E: 18.↓. External communication error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
External
communication
error
End
Continuous flash
Refer to "Error code table (Outdoor unit)"
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
- (03-18) -
1 time flash
8 time flash
E: 18
on page 03-4
Main PCB
2. Troubleshooting with error code