Fujitsu AOUH18LMAS1, Service Manual

Page: 60 / 215

2-4. E: 18.X. 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
outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4
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
→LAN adapter failure
Main PCB
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
End
2-4. E: 18.↓. External communication error (Indoor unit)
- (03-18) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G