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
Wi-fi adapter failure
Main PCB
Check point 1. Check the connection
• Check any loose or removed connection between the main PCB to the Wi-fi 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 Wi-fi adapter and the main PCB (If there is loose con-
nector, open cable or mis-wiring.)
↓
Check point 2. Replace the Wi-fi adapter
If check point 1 do not improve the symptom, change Wi-fi 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) - (03-7) - 2. Troubleshooting with error code
TROUBLESHOOTING
TROUBLESHOOTING
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