Fujitsu ARXG45KHTA - E: 18. External Communication Error (Indoor Unit)

2-5. E: 18. External communication error (Indoor unit)
Indicator
→ired remote
controller
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
→LAN Adapter failure
Main PCB
Check point 1. Check the connection
• Check any loose or removed connection between the main PCB to the →LAN 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 the main PCB
If check point 2 do not improve the symptom, replace the main PCB.

End
2-5. E: 18. External communication error (Indoor unit) - (03-11) - 2. Troubleshooting with error code
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